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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.

  • 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 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...

    $15.94
  •  ASF Reef Shots Calcium - 24 Shots  ASF Reef Shots Calcium - 24 Shots

    Aquarium Systems

    ASF Reef Shots Calcium - 24 Shots

    ASF Reef Shots Calcium - 24 Shots Many reef organisms synthesise calcium and strontium to form shells or skeleton from the seawater. Strontium Reef Shot is a quick and easy way to increase or maintain the optimum concentration of strontium in a reef...

    Was: $18.50
    Now: $15.73
  • ASF Reef Shots Reef Bacteria Food - 24 Shots ASF Reef Shots Reef Bacteria Food - 24 Shots ASF Reef Shots Reef Bacteria Food - 24 Shots

    Aquarium Systems

    ASF Reef Shots Reef Bacteria Food - 24 Shots

    ASF Reef Shots Reef Bacteria Food - 24 Shots Most corals slowly lose their brilliant colours because they are not getting all the nutrients they need. This is because corals are filter feeders and normally ingest lots of bacteria, were they get most of...

    Was: $18.50
    Now: $15.73
  • ASF Reef Shots Vitamins - 24 Shots ASF Reef Shots Vitamins - 24 Shots ASF Reef Shots Vitamins - 24 Shots

    Aquarium Systems

    ASF Reef Shots Vitamins - 24 Shots

    ASF Reef Shots Vitamins - 24 Shots Vitamins Reef Shot contains a mixture of vitamins and immunostimulants that work together to help fish and other aquatic organisms adapt and cope when introduced to new environments and stress that can occur with poor...

    Was: $18.50
    Now: $15.73
  • Hikari Prazi Pro Parasite Treatment, 4 oz.

    Hikari

    Hikari PraziPro Parasite Treatment, 4 oz.

    Hikari Prazi Pro Parasite Treatment, 4 oz. Liquid PraziPro - The World's First Ready-To-Use, Liquid Concentrate Praziquantel Treatment! Liquid PraziPro is a ready-to-use, liquid concentrate that was developed to offer the hobbyist an effective way to...

    $15.49
  • 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
  • Kalkwasser by Two Little Fishes, 1.1 lb.

    Two Little Fishies

    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
  • ESV Calcium Chloride, 800 gr. ESV Calcium Chloride, 800 gr.

    E.S.V.

    ESV Calcium Chloride, 800 gr.

    ESV Calcium Chloride, 800 gr. Maintaining proper calcium levels is essential to maintaining a healthy tank and promoting fast coral growth. ESV Calcium Chloride is a pure inorganic compound used to raise dissolved calcium levels in your tank.ESV Calcium...

    Was: $17.95
    Now: $15.26
  • 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
  • Reef Endurance Bulk Calcium Chloride, 2.5lbs Reef Endurance Bulk Calcium Chloride, 2.5lbs Reef Endurance Bulk Calcium Chloride, 2.5lbs

    Reef Endurance

    Reef Endurance Bulk Calcium Chloride, 2.5lbs

    Reef Endurance Bulk Calcium Chloride, 2.5lbs Pharmaceutical-Grade Calcium Chloride Aquarium Supplement Reef Endurance Calcium Chloride is a pharmaceutical-based aquarium supplement that mixes crystal clear with no unwanted impurities. Maintaining calcium...

    $14.99
  • 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...

    MSRP: $16.99
    Was: $16.99
    Now: $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
  • 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
  • Tropic Marin PRO-CORAL A- ELEMENTS, 200ml. Tropic Marin PRO-CORAL A- ELEMENTS, 200ml.

    Tropic Marin

    Tropic Marin PRO-CORAL A- ELEMENTS, 200ml.

    PRO-CORAL A- ELEMENTS, 200ml. by Tropic Marin. In the ocean, there are tiny amounts of essential trace elements such as iodine, lithium, manganese, etc. that can be depleted rapidly in household aquariums as corals and invertebrates grow. Tropic Marin...

    $14.65
  • Tropic Marin PRO-CORAL K+ ELEMENTS, 200ml. Tropic Marin PRO-CORAL K+ ELEMENTS, 200ml.

    Tropic Marin

    Tropic Marin PRO-CORAL K+ ELEMENTS, 200ml.

    PRO-CORAL K+ ELEMENTS, 200ml. by Tropic Marin In the ocean, there are tiny amounts of essential trace elements such as iodine, lithium, manganese, etc. that can be depleted rapidly in household aquariums as corals and invertebrates grow. Tropic Marin...

    $14.65
  • API Algaefix Freshwater, 8 oz.

    API

    API Algaefix Freshwater, 8 oz.

    At AquaCave, we offer some of the best selection & best prices on API Algaefix Freshwater for you marine, reef and freshwater aquarium.API Algaefix Freshwater, 8 oz.A revolutionary new product specially developed to control many types of algae in...

    $13.99
  • API PimaFix, 16 oz.

    API

    API PimaFix, 16 oz.

    At AquaCave, we offer some of the best selection & best prices on API PimaFix for you marine, reef and freshwater aquarium.API PimaFix, 16 oz.Treats fungal infections and both internal and external bacterial infections. Will not adversely affect the...

    $13.99
  • API Stress Coat + 16 oz. API Stress Coat + 16 oz.

    API

    API Stress Coat + 16 oz.

    API STRESS COAT + 16 OZ. STRESS COAT, with the healing power of aloe vera, is scientifically proven to reduce fish stress and heal damaged tissue. ... Helps heal torn fins and skin wounds. Reduces electrolyte loss. Also works instantly to...

    $13.99
  • 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
  • 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
  • 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...

    Was: $15.50
    Now: $13.18
  • 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...

    $13.01
  •  Ruby Reef HydroPlex 8 oz.  Ruby Reef HydroPlex 8 oz.

    Ruby Reef

    Ruby Reef HydroPlex 8 oz.

    Ruby Reef HydroPlex 8 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 penetrative...

    $12.99
  • DrTim's Aquatics FRESHWATER One & Only 2oz DrTim's Aquatics FRESHWATER One & Only 2oz

    Dr. Tim's Aquatics

    DrTim's Aquatics FRESHWATER One & Only 2oz

    DrTim's Aquatics FRESHWATER One & Only 2oz Eliminates new tank syndrome Instantly creates a biofilter Removes toxic ammonia and nitrite, naturally No sulfur or other offensive odors No wait needed 100% natural Good for 6 months at room...

    $12.99
  • DrTim's Aquatics MARINE Eco-Balance, 8oz. DrTim's Aquatics MARINE Eco-Balance, 8oz.

    Dr. Tim's Aquatics

    DrTim's Aquatics MARINE Eco-Balance, 8oz.

    DrTim's Aquatics MARINE Eco-Balance, 8oz. Research has demonstrated that friendly probiotic bacteria are key to maintaining a balanced, healthy aquarium environment. The normal processes in an aquarium upset this balance, which can allow unfriendly...

    $12.99
  • Fritz FixIck 16 oz Fritz FixIck 16 oz

    Fritz

    Fritz FixIck 16 oz

    Fritz FixIck 16 oz Fritz FixIck is a revolutionary new way to treat aquatic external parasites including Ick, Chilodonella, Trichodina and Tetrahymena. As one of the most common diseases most aquarists will encounter, finding an Ick treatment that is...

    MSRP: $14.99
    $12.99
  • Kordon Malachite Green 4oz.

    Kordon

    Kordon Malachite Green 4oz.

    Kordon Malachite Green 4oz. Top Quality - contains zinc-free chloride of Malachite Green as a 0.038% solutionKordon's Malachite Green is an effective medication used for the control of various external parasites of freshwater and marine fishes. When...

    $12.99
  • Kordon Methylene Blue 4oz.

    Kordon

    Kordon Methylene Blue 4oz.

    Kordon Methylene Blue 4oz. Methylene Blue is effective against superficial fungal infections of fish. The drug may be used as an alternative to Malachite Green for the control of fungus when it is known that the fish to be treated are sensitive...

    $12.99
  • Ruby Reef Kick-Ich Pro 8 oz. Ruby Reef Kick-Ich Pro 8 oz.

    Ruby Reef

    Ruby Reef Kick-Ich Pro 8 oz.

    Ruby Reef Kick-Ich Pro 8 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 of...

    $12.99
  • Ruby Reef Rally Pro 8 oz. Ruby Reef Rally Pro 8 oz.

    Ruby Reef

    Ruby Reef Rally Pro 8 oz.

    Ruby Reef Rally Pro 8 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...

    $12.99
  • Seachem Marine Trace 500 ml

    Seachem

    Seachem Marine Trace 500 ml

    Seachem Marine Trace 500 ml Replenishment of a number of trace elements is required to maintain an environment ideal for the growth and reproduction of marine life, but while the importance of trace elements has been recognized by aquarists for many...

    $12.99