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Aquarium additives and supplements are necessary for the survival of the animals in a saltwater or freshwater tank. Aquarium supplements make it possible for an aquarist to keep aquarium water parameters within the correct ranges, thereby increasing health and vigor.
Many of these additives are important for the well being of you aquarium inhabitants. Some of the basics for reef tanks include Calcium and Alkalinity, magnesium and Iodine. Many additives and supplements may be used to establish water parameters conducive to the husbandry of freshwater fishes, plants, and invertebrates in aquarium filled with purified water, to replenish depleted elemental concentrations in aquarium that rarely receive a water change, and to re-establish beneficial mineral concentrations in aquarium following large water changes.

At AquaCave, we offer some of the best selection and best prices on aquarium additives and supplements for you marine, reef and freshwater aquarium.

  • DrTim's Aquatics MARINE First Defense 32oz. DrTim's Aquatics MARINE First Defense 32oz.

    Dr. Tim's Aquatics

    DrTim's Aquatics MARINE First Defense 32oz.

    DrTim's Aquatics MARINE First Defense 32oz. Changing the environment of a fish causes stress that robs the fish of essential nutrients and can weaken their immune system. First Defense is scientifically designed to provide stress relief and support the...

    $31.17
  • Red Sea Reef Foundations A (Ca/SR) 1 LITER

    Red Sea

    Red Sea Reef Foundations A (Ca/SR) 1 LITER

    Red Sea Reef Foundations A (Ca/SR) 1 LITER Calcium and strontium complex for balanced formation of the coral skeletonCa | Sr Calcium, magnesium, strontium and carbonate are the basic foundation elements of coral skeletons.All of these elements need to...

    $30.99
  • Red Sea Reef Foundations B (Alk) 1 LITER

    Red Sea

    Red Sea Reef Foundations B (Alk) 1 LITER

    Reef Foundation® BCarbonate & buffer complex for balanced formation of Coral SkeletonAlk Calcium, magnesium, strontium and carbonate are the basic foundation elements of coral skeletons.All of these elements need to be available in balanced...

    $30.99
  • Red Sea Reef Foundations C (MG) 1 LITER

    Red Sea

    Red Sea Reef Foundations C (MG) 1 LITER

    Red Sea Reef Foundations C (MG) 1 LITER A successful coral reef aquarium depends on how well you maintain the water parameters which are the key to a stable coral environment. All of the elements found in natural seawater play a role in providing...

    $30.99
  • ATI Essentials SPS Reef #1 (KH) - 2.7 Liter

    ATI

    ATI Essentials SPS Reef #1 (KH) - 2.7 Liter

    ATI Essentials SPS Reef #1 (KH) - 2.7 Liter Part One (Alkalinity Complex) only of the ATI Essentials SPS two-part dosing system. ATI Essentials SPS is a concentrated, ready-to-use two-part dosing system formulated for fast growth, bold coloration, and...

    $30.95
  • ATI Essentials SPS Reef #2 (CA) - 2.7 Liter

    ATI

    ATI Essentials SPS Reef #2 (CA) - 2.7 Liter

    ATI Essentials SPS Reef #2 (CA) - 2.7 Liter Part Two (Calcium Complex) only of the ATI Essentials SPS two-part dosing system. ATI Essentials SPS is a concentrated, ready-to-use two-part dosing system formulated for fast growth, bold coloration, and...

    $30.95
  •  Ruby Reef HydroPlex 32 oz.  Ruby Reef HydroPlex 32 oz.

    Ruby Reef

    Ruby Reef HydroPlex 32 oz.

    Ruby Reef HydroPlex 32 oz. HYDROPLEX is an extremely broad spectrum dip for new arrivals. A simple 10 minute dip is all it takes toeliminate problems which can be brought on by fish being introduced into the display tank.Due to its excellent...

    $29.99
  • DrTim's Aquatics Ammonium Chloride, 500g.

    Dr. Tim's Aquatics

    DrTim's Aquatics Ammonium Chloride, 500g.

    DrTim's Aquatics Ammonium Chloride, 500g. One of our most popular products is our Ammonium Chloride for fishless cycling. As the term implies fishless cycling means without fish but there needs to be a source of ammonia for the nitrifying bacteria.

    $29.99
  • Neomycin Sulfate – Treats 200 Gallons

    AquaLife

    Neomycin Sulfate – Treats 200 Gallons

    Neomycin Sulfate – Treats 200 Gallons Effective against: -Open Sores -Internal Swelling -Loss of Color -Body Distortion -Body and Fin Rot -Bacterial Infections -Guppy Disease -Furunculosis For Ornamental Fish Use Only Not For Human Consumption...

    $29.99
  • PolypLab Acids - Amino-Acids 50 ml. PolypLab Acids - Amino-Acids 50 ml.

    PolypLab

    PolypLab Acids - Amino-Acids 50 ml.

    PolypLab Acids - Amino-Acids 50 ml. The role of amino acids becomes critical in a low nutrient environment. Acids are blended with specific amino acids that our research has shown to improve coral growth and coloration. Those that inhibit coral growth...

    $29.99
  • Praziquantel – Treats 250 Gallons

    AquaLife

    Praziquantel – Treats 250 Gallons

    Praziquantel – Treats 250 Gallons Effective against: -External Parasites -Flukes -Flatworms -Turbellaria -Tapeworms -For Ornamental Fish Use Only -Not For Human Consumption – use only as directed.   Praziquantel is effective against...

    $29.99
  • Ruby Reef Kick-Ich Pro 32 oz. Ruby Reef Kick-Ich Pro 32 oz.

    Ruby Reef

    Ruby Reef Kick-Ich Pro 32 oz.

    Ruby Reef Kick-Ich Pro 32 oz. KICK-ICH is a treatment designed to be used in the display tank for the control of Ich on fish (a.k.a. “white spot disease) in marine and freshwater aquaria. It has been scientifically formulated to treat infectious stage...

    $29.99
  • Ruby Reef Rally Pro 32 oz. Ruby Reef Rally Pro 32 oz.

    Ruby Reef

    Ruby Reef Rally Pro 32 oz.

    Ruby Reef Rally Pro 32 oz. RALLY is a very effective broad spectrum treatment designed to be used directly in the display tank to eliminate external parasites, dinoflagellates, marine velvet, clownfish disease, gill flukes, etc. on fish. RALLY also...

    $29.99
  • Tropic Marin Reef Actif, 100 ml./60 gr. Tropic Marin Reef Actif, 100 ml./60 gr.

    Tropic Marin

    Tropic Marin Reef Actif, 100 ml./60 gr.

    Tropic Marin Reef Actif, 100 ml./60 gr. Tropic Marin Reef Actif performs a unique dual function as an absorber and bacterial nutrient in saltwater aquariums. In doing this it assumes a central function as the link between inorganic nutrients and the...

    $29.99
  •  Seachem Reef Advantage Calcium, 1,000 gr.  Seachem Reef Advantage Calcium, 1,000 gr.

    Seachem

    Seachem Reef Advantage Calcium, 1,000 gr.

     Seachem Reef Advantage Calcium, 1,000 gr. Reef Advantage Calcium™ is a non-caustic (pH 8.3–8.6) optimized blend of ionic calcium designed to restore and maintain calcium to levels found in natural seawater. Calcium and carbonates are...

    $29.95
  • ATI Elements Nutrition C - 500 mL ATI Elements Nutrition C - 500 mL

    ATI

    ATI Elements Nutrition C - 500 mL

    ATI Nutrition C - 500 mL Nutrition C fulfills two important functions at once: It naturally and biologically reduces high levels of nutrients (PO4, NO3). It promotes the energy metabolism of corals and microorganisms by the containing nutrients and...

    $29.95
  • ATI Elements Nutrition N - 500 mL ATI Elements Nutrition N - 500 mL

    ATI

    ATI Elements Nutrition N - 500 mL

    ATI Nutrition N - 500 mL Nutrtion N supplies your reef inhabitants with a variety of different, easily usable nitrogen sources. These bioactive nitrogen complexes not only serve as a food source for many bacteria and microorganisms, but also for your...

    $29.95
  • ATI Elements Nutrition P - 500 mL ATI Elements Nutrition P - 500 mL

    ATI

    ATI Elements Nutrition P - 500 mL

    ATI Nutrition P - 500 mL Nutrtrtion P contains biologically available phosphorus. Phosphorus plays a key role as a regulator of biomass in an ecosystem. Under typical aquaristic conditions (PO4 value less than 0.025 mg / l) phosphorus may already...

    $29.95
  • ATI ICP Element Alkalinity - 1000 mL

    ATI

    ATI ICP Element Alkalinity - 1000 mL

    ATI ICP Element Alkalinity - 1000 mL ATI ICP Element Alkalinity is a high-purity, high-concentration solution designed to restore and maintain alkalinity levels in reef aquariums. Why It’s Important Alkalinity is essential for skeleton development...

    $29.95
  • ATI ICP Element Boron - 2700 mL

    ATI

    ATI ICP Element Boron - 2700 mL

    ATI ICP Element Boron - 2700 mL ATI ICP Element Boron is a high-purity solution designed to restore boron levels in reef aquariums. Why It’s Important Boron strengthens the coral tissue of soft corals and improves skeletal formation and coloration...

    $29.95
  • ATI ICP Element Bromine - 1000 mL

    ATI

    ATI ICP Element Bromine - 1000 mL

    ATI ICP Element Bromine - 1000 mL levels in reef aquariums.  Why It’s Important Bromine supports coral tissue structure, microbial activity, and overall biological stability. Bromine strengthens the coral tissues of soft corals, leather...

    $29.95
  • ATI ICP Element Calcium - 1000 mL

    ATI

    ATI ICP Element Calcium - 1000 mL

    ATI ICP Element Calcium - 1000 mL ATI ICP Element Calcium is a high-purity, high-concentration solution used to restore and maintain calcium levels in reef aquariums. Why It’s Important Calcium is a core building block of coral skeletons and is...

    $29.95
  • ATI ICP Element Fluorine - 1000 mL

    ATI

    ATI ICP Element Fluorine - 1000 mL

    ATI ICP Element Fluorine - 1000 mL levels in reef aquariums. Why It’s Important Fluorine is vital for coral coloration and skeletal strength, particularly in LPS and SPS corals. Fluorine contributes to deeper, more vivid coloration, especially in...

    $29.95
  • ATI ICP Element Iodine - 1000 mL

    ATI

    ATI ICP Element Iodine - 1000 mL

    ATI ICP Element Iodine - 1000 mL ATI ICP Element Iodine is a high-purity solution formulated to restore iodine levels in reef aquariums. Why It’s Important Iodine supports coral coloration, tissue development, molting in invertebrates, and overall...

    $29.95
  • ATI ICP Element Potassium - 1000 mL

    ATI

    ATI ICP Element Potassium - 1000 mL

    ATI ICP Element Potassium - 1000 mL ATI ICP Element Potassium is a high-purity solution used to restore potassium levels in reef aquariums. Why It’s Important Potassium supports vibrant coloration in SPS corals and plays a role in invertebrate...

    $29.95
  • ATI ICP Element Strontium - 1000 mL

    ATI

    ATI ICP Element Strontium - 1000 mL

    ATI ICP Element Strontium - 1000 mL ATI ICP Element Strontium is a high-purity solution formulated to restore strontium levels in reef aquariums. Why It’s Important Strontium is found in the aragonite structure alongside calcium and plays a vital...

    $29.95
  • ATI ICP Element Sulfur - 500 g

    ATI

    ATI ICP Element Sulfur - 500 g

    ATI ICP Element Sulfur - 500 g ATI ICP Element Sulfur is a high-purity powdered supplement used to restore sulfur levels in reef aquariums. Why It’s Important Sulfur strengthens coral tissue and is critical for the health of soft corals and...

    $29.95
  • BlueLife Combo Pack Red Cyano-Rx & Phosphate-Rx BlueLife Combo Pack Red Cyano-Rx & Phosphate-Rx

    BlueLife Combo Pack Red Cyano-Rx & Phosphate-Rx

    BlueLife Combo Pack Red Cyano Rx & Phosphate Rx BlueLife Phosphate Rx - 1 oz Phosphate Rx is an amazingly simple and effective product that has revolutionized the way phosphates are removed from saltwater and freshwater aquariums. When added, the...

    $29.95
  • BlueLife Flux-Rx 200 gal / 4000 mg BlueLife Flux-Rx 200 gal / 4000 mg

    BlueLife Flux-Rx 200 gal / 4000 mg

    BlueLife Flux Rx 200 gal / 4000 mg Flux RxTM is simple and effective with levels easily achieved and maintained quickly for effectiveness when Bryopsis or Green Hair Algae are present.How to prepare product: Turn off skimmer and discontinue using...

    $29.95
  • Brightwell Aquatics Vitamarin-C, 500 ml. / 17 oz.

    Brightwell Aquatics

    Brightwell Aquatics Vitamarin-C, 500 ml. / 17 oz.

    The benefits of vitamin-C to aquatic organisms are largely related to improved tissue growth, particularly after recently-sustained injury or illness. Corals and their allies, in particular, have been observed to benefit tremendously from regular...

    $29.95
  • Two Little Fishes BioPronto Marine, 16 oz.

    Two Little Fishies

    Two Little Fishes BioPronto Marine, 16 oz.

    Two Little Fishes BioPronto MarineTwo Little Fishies BioPronto Marine contains cultured naturally occurring microbes that rapidly start the biological filtration process. Use it to start the nitrification cycle in new aquariums or to enhance...

    $29.33
  • Red Sea Reef Colors ABCD 100ml 4-Pack Red Sea Reef Colors ABCD 100ml 4-Pack

    Red Sea

    Red Sea Reef Colors ABCD 100ml 4-Pack

    Red Sea Reef Colors ABCD 100ml 4-Pack  Red Sea Coral Colors A, B, C and D supplements contain the 31 minor and trace elements present in the skeleton and soft tissue of all corals. A - halogens (I2, Br, F2), B - potassium and boron, C - Fe and 7...

    $28.99
  • ZeoVit ZeoSpur Macroelements, 250 ml.

    ZeoVit

    ZeoVit ZeoSpur Macroelements, 250 ml.

    ZeoVit ZeoSpur MacroelementsZEOspur Macroelements is a result of further development of the Zeovit system. It is the optimal addition to ZEOspur 2.......ZeoVit ZeoSpur Macroelements, 250 ml. ZEOspur Macroelements is a result of further development of the...

    MSRP: $44.99
    Was: $33.75
    Now: $28.69
  • Seachem Reef Kalkwasser 1 kg. Seachem Reef Kalkwasser 1 kg.

    Seachem

    Seachem Reef Kalkwasser 1 kg.

    Seachem Reef Kalkwasser 1 kg. Very pure calcium hydroxide Ideal for increasing calcium in top-off water Increases pH with no impact on carbonate alkalinity Reef Kalkwasser™ is a pure calcium hydroxide with unsurpassed purity and solubility...

    $28.65
  • Boyd's Chemi-Clean Liquid Red Algae Remover, 2 oz.

    Boyd Enterprises

    Boyd's Chemi-Clean Liquid Red Algae Remover, 2 oz.

    Boyds ChemiClean Liquid Red Algae Remover2 Oz. Chemiclean cleans stains from red, black, blue-green, and methane (bubble) producing cyanobacteria in marine aquariums.It is completely safe for all fish, corals, invertebrates, and nitrifying bacteria in...

    $28.04
  • Tropic Marin NP Bacto Balance 500 ml. Tropic Marin NP Bacto Balance 500 ml.

    Tropic Marin

    Tropic Marin NP Bacto Balance 500 ml.

    Tropic Marin NP Bacto Balance 500 ml. Mixture of selected organic compounds to promote the incorporation of nitrate and phosphate in supplementary biomass. The ratio of nutrients is ideal for corals, sponges and other invertebrate animals found in reef...

    $28.03
  • Vibrant 8 oz. - Freshwater Formula Vibrant 8 oz. - Freshwater Formula

    Underwater Creations

    Vibrant 8 oz. - Freshwater Formula

    Vibrant 8 oz. - Freshwater Formula  8 oz. Vibrant Liquid Aquarium Cleaner for Freshwater Aquariums - For Live Planted and Decorative Freshwater AquariumsVibrant is a new revolutionary liquid aquarium cleaner. You can say goodbye to algae, cloudy...

    $27.99
  • Vibrant 8 oz. - Reef Formula Vibrant 8 oz. - Reef Formula Vibrant 8 oz. - Reef Formula

    Underwater Creations

    Vibrant 8 oz. - Reef Formula

    Vibrant 8 oz. - Reef Formula  Vibrant is a new revolutionary liquid aquarium cleaner. You can say goodbye to algae, cloudy water and that grungy, dirty aquarium and say hello to that sparkling, crystal clear, algae free, vibrant aquarium you have...

    $27.99
  • Vibrant 8 oz. - Saltwater Fish Only Formula Vibrant 8 oz. - Saltwater Fish Only Formula Vibrant 8 oz. - Saltwater Fish Only Formula

    Underwater Creations

    Vibrant 8 oz. - Saltwater Fish Only Formula

    Vibrant 8 oz. - Saltwater Fish Only Formula 8 oz. Vibrant Liquid Aquarium Cleaner for Saltwater Aquariums - For Fish Only Saltwater AquariumsVibrant is a new revolutionary liquid aquarium cleaner. You can say goodbye to algae, cloudy water and that...

    $27.99
  • Tropic Marin Elim-Phos Rapid 500 ml.

    Tropic Marin

    Tropic Marin Elim-Phos Rapid 500 ml.

    Tropic Marin Elim-Phos Rapid 500 ml. Particularly during new aquarium "break-in" and during rock curing and cycling, phosphate can often rapidly accumulate in the water. During this time Lanthanum chloride products are ideal for rapidly precipitating...

    $27.25
  • PolypLab Poly-Booster 100 ml.

    PolypLab

    PolypLab Poly-Booster 100 ml.

    PolypLab Poly-Booster 100 ml. Contains 18 Amino-acids (60% of dry weight)Contains 12 Fatty acids (20% of dry weight)Contains  as much as 120ppm of Astaxanthan pigment, from natural sources.Can trigger a feeding response in most aquarium inhabitants...

    $26.99
  • PolypLab Reef Genesis 50 ml. PolypLab Reef Genesis 50 ml.

    PolypLab

    PolypLab Reef Genesis 50 ml.

    PolypLab Reef Genesis 50 ml. Working with a Canadian biotechnology firm, we have manufactured a custom blend of bacterial strains with concentrations of over 80 billion cells/mL. In their planktonic state, these bacteria serve as a highly nutritious...

    $26.99
  • Brightwell Aquatics KoraLagoon Substrate, 1.4 kg. / 3.1 lb.

    Brightwell Aquatics

    Brightwell Aquatics KoraLagoon Substrate, 1.4 kg. / 3.1 lb.

    Brightwell Aquatics KoraLagoonSubstrat Aragonite RefugiumSubstrateA blend of high-purity aragonite particulate grades to simulate the natural substrate particle profile of tropical reef lagoonsBrightwell Aquatics KoraLagoon Substrate, 1.4 kg. / 3.1 lb. A...

    $26.95
  • C-Balance by Two Little Fishes, 2 x 32 oz.

    Two Little Fishies

    C-Balance by Two Little Fishes, 2 x 32 oz.

    C-Balance by Two Little Fishes, 2 x 32 oz. This two-part calcium and alkalinity maintenance system adjusts calcium, magnesium, and strontium ions to Natural Seawater ratios, and achieves a balanced ionic residual. Makes replenishment of calcium and...

    $26.63
  • BlueLife Phosphate-Rx - 1 oz BlueLife Phosphate-Rx - 1 oz

    BlueLife Phosphate-Rx - 1 oz

    BlueLife Phosphate Rx - 1 oz Phosphate Rx is an amazingly simple and effective product that has revolutionized the way phosphates are removed from saltwater and freshwater aquariums. When added, the formula rapidly binds to phosphate molecules making...

    $26.30
  • Tropic Marin Amino-Organic 250mL

    Tropic Marin

    Tropic Marin Amino-Organic 250mL

    Tropic Marin Amino-Organic 250mL Stimulates coral growth, intensifies colouring and reduces phosphate in the reef aquarium biologically. Pale or brownish corals are often caused by too weak a concentration of easily digestible nitrogen compounds...

    $26.18
  • ZeoVit Iron Concentrate, 100 ml.

    ZeoVit

    ZeoVit Iron Concentrate, 100 ml.

    ZeoVit Iron ConcentrateZeoVit Iron Concentrate, 100 ml.The addition of iron affects all colors but primarily enhances the green color formation. Iron encreases coral growth and also the multiplication of zooxanthella. Well suited for all kind of...

    MSRP: $39.99
    Was: $29.99
    Now: $25.49
  • ESV Calcium Hydroxide, Kalkwasser Powder, 3.5 lb. ESV Calcium Hydroxide, Kalkwasser Powder, 3.5 lb.

    E.S.V.

    ESV Calcium Hydroxide, Kalkwasser Powder, 3.5 lb.

    ESV Calcium Hydroxide, Kalkwasser Powder, 3.5 lb. Dosing with Kalkwasser is one of the very few proven, effective methods to add calcium and alkalinity with a single product while maintaining pH. Commonly used in conjunction with auto top off systems...

    Was: $29.95
    Now: $25.46
  • DrTim's Aquatics MARINE Re-Fresh 8oz. DrTim's Aquatics MARINE Re-Fresh 8oz.

    Dr. Tim's Aquatics

    DrTim's Aquatics MARINE Re-Fresh 8oz.

    DrTim's Aquatics MARINE Re-Fresh 8oz Control Green or Brown Water in your Reef, Nano, or Seahorse Aquarium Use Dr.Tim's Re-Fresh in your reef, nano, or seahorse aquarium to control brown or green water issues. Re-Fresh is a potent combination of...

    $24.99
  • Frank's Tanks F-Aiptasia - 2 oz Frank's Tanks F-Aiptasia - 2 oz Frank's Tanks F-Aiptasia - 2 oz

    F-Aiptasia

    Frank's Tanks F-Aiptasia - 2 oz

    Frank's Tanks F-Aiptasia - 1 oz This proven and effective treatment helps kill aiptasia and prevents it from reproducing. When used properly, it is reef safe and will not harm corals or other inhabitants. If you've ever had aiptasia anemones in your...

    $24.99
  • PolypLab Plus - Vitamin Formulation 50 ml. PolypLab Plus - Vitamin Formulation 50 ml.

    PolypLab

    PolypLab Plus - Vitamin Formulation 50 ml.

    PolypLab Plus - Vitamin Formulation 50 ml. Plus is a water-stable mixture of liquid and solid coral foods that have been enriched with vitamins and minerals. Vibrant coral coloration results from regular use and is most noticeable for SPS corals...

    $24.99