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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 FRESHWATER First Defense, 16 oz DrTim's Aquatics FRESHWATER First Defense, 16 oz

    Dr. Tim's Aquatics

    DrTim's Aquatics FRESHWATER First Defense, 16 oz

    DrTim's Aquatics FRESHWATER First Defense, 16 oz Create a calm and restorative place for your fish to call home with Dr. Tim’s Freshwater First Defense Aquarium Cleaner. This freshwater cleaner is designed to help your fish adapt to a new environment by...

    $15.95
  • Seachem ParaGuard 500 ml. Seachem ParaGuard 500 ml.

    Seachem

    Seachem ParaGuard 500 ml.

    Seachem ParaGuard 500 ml. ParaGuard is the only fish and filter safe aldehyde based (10% by weight) parasite control product available. Unlike highly toxic and difficult to use formalin based medications, ParaGuard contains no formaldehyde or methanol...

    $15.95
  • Seachem Prime, 500 ml. Seachem Prime, 500 ml.

    Seachem

    Seachem Prime, 500 ml.

    Seachem Prime, 500 ml. Prime™ is the complete and concentrated conditioner for both fresh and salt water. Prime™ removes chlorine, chloramine and ammonia. Prime™ converts ammonia into a safe, non-toxic form that is readily removed...

    $15.95
  • Two Little Fishes Marine Snow, 16oz.

    Two Little Fishes

    Two Little Fishes Marine Snow, 16oz.

    MarineSnow Plankton Diet is a first of its kind product that reproduces the special biogenic suspended matter found in natural seawater, including marine snow aggregates...MarineSnow Plankton Diet is a first of its kind product that reproduces the...

    $15.90
  • ASF Reef Shots Iodide - 24 Shots ASF Reef Shots Iodide - 24 Shots ASF Reef Shots Iodide - 24 Shots

    Aquarium Systems

    ASF Reef Shots Iodide - 24 Shots

    ASF Reef Shots Iodide - 24 Shots Soft corals are particularly sensitive to iodide depletion and will exhibit declining growth and eventual death if iodide is not replenished. Potassium Iodide Reef Shot safely replaces important iodide lost in the...

    $15.50
  • Hikari Saltwater Ich X 16 Oz. Hikari Saltwater Ich X 16 Oz.

    Hikari

    Hikari Saltwater Ich X 16 Oz.

    Ich X Treatment for Saltwater Aquariums. The Ich X Treatment for Saltwater Aquariums is a safe and effective way to treat disease conditions caused by marine Ich. The Ich X Treatment for Saltwater Aquariums is a clear formula that won’t stain or...

    $15.49
  • Sea Lab #28 Replenisher 1/2 lb. Jar Sea Lab #28 Replenisher 1/2 lb. Jar

    Sea Lab #28 Replenisher 1/2 lb. Jar

    Sea Lab #28 Replenisher 1/2 lb. Jar Approximately 50 nuggets.   Sea-Lab Formula 28 is a mixture of naturally occurring buffer compounds that maintains natural ocean concentrations of calcium, strontium, and all 15 essential trace elements. Calcium and...

    Was: $17.99
    Now: $15.29
  •  Kalkwasser by Two Little Fishes, 1.1 lb.

    Two Little Fishes

    Kalkwasser by Two Little Fishes, 1.1 lb.

    Reef Kalkwasser is a pure calcium hydroxide with unsurpassed purity and solubility characteristics...Kalkwasser by Two Little Fishes, 1 lb.Calcium Supplement Mix. Our pure source of Calcium Hydroxide makes the ideal solution for replenishing calcium and...

    $15.26
  • Caribsea Purple Up 16 oz Caribsea Purple Up 16 oz

    CaribSea

    Caribsea Purple Up 16 oz

    PURPLE-UP Coraline Algae Accelerator by CaribSea, 16 oz. NOT A FERTILIZER: Purple Up™ encourages the growth of desirable pink and purple coralline algaes not nuisance algaes not nuisance algaes.UNIQUE DUAL METHOD APPROACH TO CORALLINE ALGAE...

    Was: $17.95
    Now: $15.26
  • Copper Power, Marine 16 oz. Copper Power, Marine 16 oz.

    Copper Power

    Copper Power, Marine 16 oz.

     Copper Power, Marine 16 OZ.   Copper Power Marine is one of the safest and most effective copper medications available for the elimination of external parasites. Used at 2.5 PPM Copper - nearly 5-Times the normal toxic level of copper in...

    Was: $16.99
    Now: $14.99
  • DrTim's Aquatics MARINE Clear-Up 4oz. DrTim's Aquatics MARINE Clear-Up 4oz.

    Dr. Tim's Aquatics

    DrTim's Aquatics MARINE Clear-Up 4oz.

    DrTim's Aquatics MARINE Clear-Up 4oz. Clear-UP clears cloudy white water.  Clear-UP is a 100% natural water clarifier consisting of beneficial bacteria, with the ability to "floc" small particles from the aquarium water.The result is clear water...

    $14.99
  • DrTim's Aquatics MARINE First Defense 8oz. DrTim's Aquatics MARINE First Defense 8oz.

    Dr. Tim's Aquatics

    DrTim's Aquatics MARINE First Defense 8oz.

    DrTim's Aquatics MARINE First Defense 8oz. 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...

    $14.99
  • DrTim's Aquatics MARINE Re-Fresh 4oz. DrTim's Aquatics MARINE Re-Fresh 4oz.

    Dr. Tim's Aquatics

    DrTim's Aquatics MARINE Re-Fresh 4oz.

    DrTim's Aquatics MARINE Re-Fresh 4oz 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...

    $14.99
  • PolypLab Reef Primer Shot Coral Dip 45 gr. PolypLab Reef Primer Shot Coral Dip 45 gr.

    PolypLab

    PolypLab Reef Primer Shot Coral Dip 45 gr.

    PolypLab Reef Primer Shot Coral Dip 45 gr. TO BE USED AS A DIP ONLY. Not to be used in the aquarium. Reef Primer is a premium dip for your corals and frags. Use in your acclimation routine before adding new corals to your system. Reef Primer will...

    $14.99
  • Red Sea Reef Energy B (Aminovit nutrition) - 500ml

    Red Sea

    Red Sea Reef Energy B (Aminovit nutrition) - 500ml

    Red Sea Reef Energy B (Aminovit nutrition) - 500ml Reef Energy B is a highly concentrated complex of vitamins & amino acids that were found to be the limiting factors in the nutritional demands of corals and other invertebrates. Red Sea Reef...

    $14.99
  • Seachem Reef Fusion #1 1 Liter Seachem Reef Fusion #1 1 Liter

    Seachem

    Seachem Reef Fusion #1 1 Liter

    Seachem Reef Fusion #1 1 Liter Reef Fusion two-part system Product Description Reef Fusion 1� and Reef Fusion 2� are the foundation of a system formulated to provide the essentials for the reef aquarium. Reef Fusion 1� provides calcium, while...

    $14.99
  • Seachem Reef Fusion #2 1 Liter Seachem Reef Fusion #2 1 Liter

    Seachem

    Seachem Reef Fusion #2 1 Liter

    Seachem Reef Fusion #2 1 Liter Reef Fusion two-part system Product Description Reef Fusion 1� and Reef Fusion 2� are the foundation of a system formulated to provide the essentials for the reef aquarium. Reef Fusion 1� provides calcium, while...

    $14.99
  • Seachem Reef Iron 500mL

    Seachem

    Seachem Reef Iron 500mL

    Seachem Reef Iron 500mL Iron is an essential element required in metabolic processes, protein synthesis, and growth of corals and macroalgae. Iron supplementation can enhance coral and macroalgae growth and color – particularly yellow and green...

    $14.99
  • Seachem Reef Kalkwasser 500 gr. Seachem Reef Kalkwasser 500 gr.

    Seachem

    Seachem Reef Kalkwasser 500 gr.

    Seachem Reef Kalkwasser 500 gr. 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...

    $14.99
  • Seachem Stability 500 ml. Seachem Stability 500 ml.

    Seachem

    Seachem Stability 500 ml.

    Seachem Stability 500 ml. New tank stabilization system for marine and freshwater Rapidly and safely establishes bio-filter Prevents "New Tank Syndrome" Stability® will rapidly and safely establish the aquarium biofilter in freshwater and marine...

    $14.99
  • Brightwell Aquatics Clarifi-FW 500 ml. Brightwell Aquatics Clarifi-FW 500 ml.

    Brightwell Aquatics

    Brightwell Aquatics Clarifi-FW 500 ml.

    Brightwell Aquatics Clarifi-FW 500 ml. Advanced Clarifier for all Freshwater and Planted Aquaria  Overview Flocculant for improving water clarity in freshwater aquaria; helps eliminate cloudy water. Binds particulate material suspended in...

    $14.95
  • Brightwell Aquatics Clarifi-SW, 500 ml. / 17 oz.

    Brightwell Aquatics

    Brightwell Aquatics Clarifi-SW, 500 ml. / 17 oz.

    Brightwell Aquatics Clarifi-SW, Advanced Clarifier for All Marine Fish and Reef AquariaPoor water clarity can be caused by a number of types of suspended particulate material, which may themselves be caused by excessive nutrient concentrations,...

    $14.95
  • Brightwell Aquatics FaStart-F 500 ml. Brightwell Aquatics FaStart-F 500 ml.

    Brightwell Aquatics

    Brightwell Aquatics FaStart-F 500 ml.

    Brightwell Aquatics FaStart-F 500 ml. Balanced nutrient source for establishing and maintaining biological filtration in freshwater aquaria  • Formulated specifically for freshwater biotope, community, and planted aquaria. • Used in...

    $14.95
  • Brightwell Aquatics FaStart-M Nutrient Balance 500 ml. Brightwell Aquatics FaStart-M Nutrient Balance 500 ml.

    Brightwell Aquatics

    Brightwell Aquatics FaStart-M Nutrient Balance 500 ml.

    Brightwell Aquatics FaStart-M Nutrient Balance 500 ml. Shake product well before each use. Though FaStart-M may be used in any established marine aquarium, it is intended for use in systems dosed with MicrōBacter7. Greatest stability of biological...

    $14.95
  • Brightwell Aquatics Fish recover Fw (Fresh) 500 ml. Brightwell Aquatics Fish recover Fw (Fresh) 500 ml.

    Brightwell Aquatics

    Brightwell Aquatics Fish recover Fw (Fresh) 500 ml.

    Brightwell Aquatics Fish recover Fw (Fresh) 500 ml. natural herbal medication for open sores, redness in fins body, cloufy eyes, tail and fin rot Overview All-Natural, botanical extract remedy for the treatment of a broad spectrum of bacterial...

    $14.95
  • Brightwell Aquatics Florin-I 500 ml. Brightwell Aquatics Florin-I 500 ml.

    Brightwell Aquatics

    Brightwell Aquatics Florin-I 500 ml.

    Brightwell Aquatics Florin-I 500 ml. Copper free and shrimp safe. Provides iodide, utilized by crustaceans (shrimp, lobsters, and crabs) to molt or shed their exoskeleton, enabling the crustacean to grow. Formulated specifically for ornamental...

    $14.95
  • Brightwell Aquatics Florin-P 500 ml. Brightwell Aquatics Florin-P 500 ml.

    Brightwell Aquatics

    Brightwell Aquatics Florin-P 500 ml.

    Brightwell Aquatics Florin-P 500 ml. Inorganic Phosphorus Source for all Planted Aquaria  Overview Concentrated source of inorganic phosphorus for use in planted aquaria. Formulated utilizing extensive research on aquatic plant nutrient...

    $14.95
  • DrTim's Aquatics NP-Active Pearls 150ml DrTim's Aquatics NP-Active Pearls 150ml DrTim's Aquatics NP-Active Pearls 150ml DrTim's Aquatics NP-Active Pearls 150ml DrTim's Aquatics NP-Active Pearls 150ml

    Dr. Tim's Aquatics

    DrTim's Aquatics NP-Active Pearls 150ml

    DrTim's Aquatics NP-Active Pearls 150ml A novel, innovative way, using PURE biodegradable bio-polymers, to control nitrate and phosphate in your aquarium. Specially developed for aquariums Works in ALL aquariums Safe for ALL fish and corals PURE -...

    $14.95
  • ESV Bionic Magnesium, 32 oz. ESV Bionic Magnesium, 32 oz.

    E.S.V.

    ESV Bionic Magnesium, 32 oz.

    ESV Bionic Magnesium, 32 oz. Through the chemical process known as "ion-pairing" magnesium ion concentration influences the saturation point for calcium corbonate in solution. In general the further the magnesium concentration drops from natural...

    $14.95
  • ReefHD Reef-Flux - 10 Capsules  ReefHD Reef-Flux - 10 Capsules

    ReefHD

    ReefHD Reef-Flux - 10 Capsules

    ReefHD Reef Flux - 10 Capsules Reef Flux is an aquarium fluconazole treatment that is effective against fungal fish infections. A filter sock is recommended if using Reef Flux in tanks that contain Bryopsis and Caulerpa. To avoid unintended nutrient...

    $16.99
    $14.95
  • Seachem Clarity 500 ml. Seachem Clarity 500 ml.

    Seachem

    Seachem Clarity 500 ml.

    Seachem Clarity 500 ml. Water clarifier for marine and freshwater Clears all types of clouding Reef and plant safe Clarity™ is the ultimate clarifier for both fresh and saltwater. It employs an advanced polymeric flocculating agent that is both...

    $14.95
  •  Tropic Marin BIO-STRONTIUM, 200gr.   Tropic Marin BIO-STRONTIUM, 200gr.

    Tropic Marin

    Tropic Marin BIO-STRONTIUM, 200gr.

    Tropic Marin BIO-STRONTIUM, 200gr. Tropic Marin Bio-Strontium is biologically Ideal Strontium Supplement for Reef Aquariums. A sufficient supply of strontium and carbon dioxide is as essential for the growth and well-being of reef-building corals...

    $14.67
  • ASF Reef Shots Coralline Booster - 24 Shots ASF Reef Shots Coralline Booster - 24 Shots ASF Reef Shots Coralline Booster - 24 Shots

    Aquarium Systems

    ASF Reef Shots Coralline Booster - 24 Shots

    ASF Reef Shots Coralline Booster - 24 Shots Coralline Booster Reef Shot is a solution of substances intended to promote the synthesis of calcium in corals and algae. It prevents bleaching and assists the formation of a solid, homogenous skeleton in...

    $14.50
  • ZeoVit Cyano Clean, 10 ml.

    ZeoVit

    ZeoVit Cyano Clean, 10 ml.

    ZeoVit Cyano Clean, 10 ml. Developed as a companion product to Coral Snow and Zeozym, Cyano Clean safely eliminates unsightly red slime algae (Cyanobacteria) from the reef tank. Cyano Clean is formulated with select nutrient scavenging bacteria strains...

    $18.99
    $14.24
  • Frank's Tanks F-Aiptasia - 1 oz Frank's Tanks F-Aiptasia - 1 oz Frank's Tanks F-Aiptasia - 1 oz

    F-Aiptasia

    Frank's Tanks F-Aiptasia - 1 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...

    $13.99
  • Tropic Marin Elimi NP 50 ml. Tropic Marin Elimi NP 50 ml.

    Tropic Marin

    Tropic Marin Elimi NP 50 ml.

    Tropic Marin Elimi NP 50 ml. For the general health and well being of your reef inhabitants, it's beneficial to maintain nitrate and phosphate at very low concentrations. This encourages better coral calcification while also discouraging excess algae...

    $13.99
  • Brightwell Aquatics NeoNitro, 500 ml. / 17 oz.

    Brightwell Aquatics

    Brightwell Aquatics NeoNitro, 500 ml. / 17 oz.

    Brightwell Aquatics NeoNitro, 500 ml. / 17 oz. Overview Used in conjunction with MICROBACTER7 and REEF BIOFUEL or KATALYST, enables natural phosphorus uptake to take place in systems with inadequate nitrogen content, lowering phosphate...

    $13.95
  • Brightwell Aquatics NeoPhos, 500 ml. / 17 oz.

    Brightwell Aquatics

    Brightwell Aquatics NeoPhos, 500 ml. / 17 oz.

    Brightwell Aquatics NeoPhos, 500 ml. / 17 oz. Overview Used in conjunction with MICROBACTER7 and REEF BIOFUEL or KATALYST, enables natural nitrogen uptake to take place in systems with inadequate phosphorus content, lowering ammonia, nitrite, and...

    $13.95
  • ESV Calcium Hydroxide, Kalkwasser Powder, 14 oz. ESV Calcium Hydroxide, Kalkwasser Powder, 14 oz.

    E.S.V.

    ESV Calcium Hydroxide, Kalkwasser Powder, 14 oz.

    ESV Calcium Hydroxide, Kalkwasser Powder, 14 oz. 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...

    $13.95
  • ESV Liquid Carbonate Buffer 32 fl. oz. ESV Liquid Carbonate Buffer 32 fl. oz.

    E.S.V.

    ESV Liquid Carbonate Buffer 32 fl. oz.

    ESV Liquid Carbonate Buffer 32 fl. oz. Liquid Carbonate Buffer is a one component liquid additive with an alkalinity value of 2476 meq/L, in the form of sodium bicarbonate and sodium carbonate. Liquid Carbonate Buffer is useful for raising alkalinity in...

    $13.95
  • Seachem Reef Buffer, 500 gr. Seachem Reef Buffer, 500 gr.

    Seachem

    Seachem Reef Buffer, 500 gr.

    Seachem Reef Buffer, 500 gr. Reef Buffer™ is intended primarily for use in a reef system where the maintenance of a pH of 8.3 is often difficult. When used as directed Reef Buffer™ will raise the pH of your reef system to 8.3 without fear of...

    $13.95
  • Seachem Reef Builder, 600 gr. Seachem Reef Builder, 600 gr.

    Seachem

    Seachem Reef Builder, 600 gr.

    Reef Builder raises carbonate alkalinity without immediately impacting on pH. With long term use there will be a tendency to stabilize at pH 8.3...Seachem Reef Builder, 600 gr.Reef Builder ™ raises carbonate alkalinity without immediately...

    $13.95
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