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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.

  • Tropic Marin PRO-CORAL A- ELEMENTS, 1,000 ml.

    Tropic Marin

    Tropic Marin PRO-CORAL A- ELEMENTS, 1,000 ml.

    Tropic Marin PRO-CORAL A- ELEMENTS, 1,000ml. 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...

    $38.42
  • Tropic Marin PRO-CORAL K+ ELEMENTS, 1,000ml. Tropic Marin PRO-CORAL K+ ELEMENTS, 1,000ml.

    Tropic Marin

    Tropic Marin PRO-CORAL K+ ELEMENTS, 1,000ml.

    Tropic Marin PRO-CORAL K+ ELEMENTS, 1,000ml. 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...

    $38.42
  • Seachem Safe 1 Kg. Seachem Safe 1 Kg.

    Seachem

    Seachem Safe 1 Kg.

    Seachem Safe 1 Kg. Description Safe� is the complete and concentrated dry conditioner for both fresh and salt water. Safe� removes chlorine, chloramine, and ammonia. Safe� converts ammonia into a safe, non-toxic form that is readily removed by...

    $38.27
  • ESV Bionic Calcium Buffer System, 2 x 1 gal ESV Bionic Calcium Buffer System, 2 x 1 gal

    E.S.V.

    ESV Bionic Calcium Buffer System Concentrate, 2 x 1 gal.

    ESV Bionic Calcium Buffer System Concentrate, 2 x 1 gal.  B-Ionic Calcium Buffer is the original, unique, easy-to-use, two-component liquid supplement system. When using equal volumes of each component, the aquarist can easily maintain calcium and...

    Was: $44.95
    Now: $38.21
  • Triton Flourine Supplement, 1000ml Triton Flourine Supplement, 1000ml

    Triton

    Triton Flourine Supplement, 1000ml

    Triton Flourine Supplement, 1000ml The Triton System is based on accurate ICP-OES Testing that tells you exactly how much of any element may be in your aquarium allowing you to keep a healthy, sustainable reef ecosystem. Triton's testing and dosing...

    $38.00
  •  Vibrant 16 oz. - Freshwater Formula    Vibrant 16 oz. - Freshwater Formula

    Underwater Creations

    Vibrant 16 oz. - Freshwater Formula

     Vibrant 16 oz. - Freshwater Formula     16 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...

    $37.99
  • Vibrant 16 oz. - Reef Formula Vibrant 16 oz. - Reef Formula

    Underwater Creations

    Vibrant 16 oz. - Reef Formula

    Vibrant 16 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...

    $37.99
  • Vibrant 16 oz. - Saltwater Fish Only Formula Vibrant 16 oz. - Saltwater Fish Only Formula Vibrant 16 oz. - Saltwater Fish Only Formula

    Underwater Creations

    Vibrant 16 oz. - Saltwater Fish Only Formula

    Vibrant 8 oz. - Saltwater Fish Only Formula 16 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...

    $37.99
  • DrTim's Aquatics NP-Active Pearls 450ml DrTim's Aquatics NP-Active Pearls 450ml DrTim's Aquatics NP-Active Pearls 450ml DrTim's Aquatics NP-Active Pearls 450ml DrTim's Aquatics NP-Active Pearls 450ml

    Dr. Tim's Aquatics

    DrTim's Aquatics NP-Active Pearls 450ml

    DrTim's Aquatics NP-Active Pearls 450ml 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 -...

    $37.29
  •  Tropic Marin CarboCalcium, 1,000 ml.   Tropic Marin CarboCalcium, 1,000 ml.

    Tropic Marin

    Tropic Marin CarboCalcium, 1,000 ml.

    Tropic Marin CarboCalcium, 1,000 ml. Tropic Marin Carbo-Calcium contains a balanced ratio of calcium and carbonate (alkalinity) in a single solution. Traditionally two or more solutions are required but Carbo-Calcium relies on biological processes to...

    $36.96
  • Brightwell Aquatics Clarifi-FW 2 Liters. Brightwell Aquatics Clarifi-FW 2 Liters.

    Brightwell Aquatics

    Brightwell Aquatics Clarifi-FW 2 Liters.

    Brightwell Aquatics Clarifi-FW 2 Liters. 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...

    $36.95
  • Brightwell Aquatics Clarifi-SW, 2 Liters / 67.6 oz.

    Brightwell Aquatics

    Brightwell Aquatics Clarifi-SW, 2 Liters / 67.6 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,...

    $36.95
  • Seachem Acid Buffer 1.2 kg. Seachem Acid Buffer 1.2 kg.

    Seachem

    Seachem Acid Buffer 1.2 kg.

    Seachem Acid Buffer 1.2 kg. Adjusts pH to 5.0-8.0 Designed for use in planted aquariums Converts carbonate alkalinity (KH) into available CO2 Contains no phosphate Acid Buffer™ is a non–phosphate buffer to lower pH and buffer with Alkaline...

    $35.99
  • Brightwell Aquatics MicroBacter Dry Rock Bacteria Starter Kit Brightwell Aquatics MicroBacter Dry Rock Bacteria Starter Kit

    Brightwell Aquatics

    Brightwell Aquatics MicroBacter Dry Rock Bacteria Starter Kit

    Brightwell Aquatics MicroBacter Dry Rock Bacteria Starter Kit This kit is designed to be used with unseeded dry rock such as Marco Rock or artificial live rock replacements. Plain dry sand is recommended instead of so called 'live sand' which may have...

    Was: $41.95
    Now: $35.66
  • Tropic Marin ICP Water Analyses - 1 Pack Tropic Marin ICP Water Analyses - 1 Pack

    Tropic Marin

    Tropic Marin ICP Water Analyses - 1 Pack

    Tropic Marin ICP Water Analyses - 1 Pack Description Professional ICP seawater laboratory analysis - ICP-OES is used to analyze over 35 chemical elements in the seawater sample.After the measurement, the user can call up the detailed analysis report...

    $35.18
  • Red Sea Skeletal elements ( Reef Foundation ABC+) - 1kg

    Red Sea

    Red Sea Skeletal elements ( Reef Foundation ABC+) - 1kg

    Red Sea Skeletal elements ( Reef Foundation ABC+) - 1kg Red Sea’s Reef Foundation ABC+ is a uniquely formulated powder supplement containing all of the elements of Foundation A, B & C, plus Red Sea’s Coral Colors A & B (potassium, boron, iodine...

    $34.99
  • Sea Lab #28 Replenisher 1 kg. Block Sea Lab #28 Replenisher 1 kg. Block

    Sea Lab #28 Replenisher 1 kg. Block

    Sea Lab #28 Replenisher 1 kg. Block 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 strontium are well recognized...

    $34.99
  • Two Little Fishes AcroPower, 1,000 ml.

    Two Little Fishies

    Two Little Fishes AcroPower, 1,000 ml.

    Two Little Fishes AcroPower, 1000 ml. Use AcroPower from Two Little Fishies to provide amino acids to your corals to help build their skeletal structure. Amino acids can easily deplete in reef aquarium systems through protein skimmers and ultra low...

    $34.98
  • ATI Essentials Mixed Reef #1 (KH) - 2.7 Liter

    ATI

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

    ATI Essentials Mixed Reef #1 (KH) - 2.7 Liter Part One (Alkalinity Complex) only of the ATI Essentials Mixed Reef two-part dosing system. ATI Essentials Mixed Reef is a highly concentrated, ready-to-use two-part dosing system designed for vibrant...

    $34.95
  • ATI Essentials Mixed Reef #2 (CA) - 2.7 Liter

    ATI

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

    ATI Essentials Mixed Reef #2 (CA) - 2.7 Liter Part Two (Calcium Complex) only of the ATI Essentials Mixed Reef two-part dosing system. ATI Essentials Mixed Reef is a highly concentrated, ready-to-use two-part dosing system designed for vibrant...

    $34.95
  • Fauna Marin Dino M, 250ml

    Fauna Marin

    Fauna Marin Dino M, 250ml

    Fauna Marin Dino M, 250ml Dinoflagellate Treatment for Reef Aquariums Combat problem dinoflagellates safely with this modernized formula that protects your coral investment while restoring aquarium balance. The next evolution in reef aquarium care,...

    $34.64
  •  Red Sea Reef Foundation A Dry (Ca/Sr) - 1kg   Red Sea Reef Foundation A Dry (Ca/Sr) - 1kg

    Red Sea

    Red Sea Reef Foundation A Dry (Ca/Sr) - 1kg

    Red Sea Reef Foundation A Dry (Ca/Sr) - 1kg Calcium, Magnesium, Strontium, and Carbonate are the basic foundation elements or coral skeletons. All of these elements need to be available in balanced proportions for coral health and growth. Reef...

    $33.99
  •  Red Sea Reef Foundation C Dry (Mg) - 1kg  Red Sea Reef Foundation C Dry (Mg) - 1kg

    Red Sea

    Red Sea Reef Foundation C Dry (Mg) - 1kg

    Red Sea Reef Foundation C Dry (Mg) - 1kg Calcium, Magnesium, Strontium, and Carbonate are the basic foundation elements or coral skeletons. All of these elements need to be available in balanced proportions for coral health and growth. Reef...

    $33.99
  • Red Sea Reef Foundation B Dry (Alk) - 1kg Red Sea Reef Foundation B Dry (Alk) - 1kg

    Red Sea

    Red Sea Reef Foundation B Dry (Alk) - 1kg

    Red Sea Reef Foundation B Dry (Alk) - 1kg Calcium, Magnesium, Strontium, and Carbonate are the basic foundation elements or coral skeletons. All of these elements need to be available in balanced proportions for coral health and growth. Reef...

    $33.99
  • Sea Lab #28 Replenisher 2 lb. Box Sea Lab #28 Replenisher 2 lb. Box

    Sea Lab #28 Replenisher 2 lb. Box

    Sea Lab #28 Replenisher 2 lb. Box Automatically controls concentrations of 28 elements including calcium, strontium and all 15 essential trace elements.Removes heavy metals and limits ammonia and phosphate while helping to buffer aquarium pH. Available...

    $33.99
  • ESV Bionic Magnesium, 1 gal. ESV Bionic Magnesium, 1 gal.

    E.S.V.

    ESV Bionic Magnesium, 1 gal.

    ESV Bionic Magnesium, 1 gal. When used with calcium and alkalinity supplements, magnesium plays an important role in stablilizing pH in your reef tank. B-Ionic Magnesium is an easy to use liquid magnesium supplement which  will not disrupt the...

    Was: $39.95
    Now: $33.96
  • BlueLife Flatworm Rx 1 oz

    BlueLife

    BlueLife Flatworm Rx 1 oz

    BlueLife Flatworm Rx 1 oz   Flatworm Rx is an exceptionally fast, safe and effective treatment for flatworms in your reef or fish only saltwater aquarium. This innovative product prevents disruptions in the biological processes as well as coral...

    $33.69
  • Red Sea Reef Foundation Liquid Starter Kit, 3 x 250 ml.

    Red Sea

    Red Sea Reef Foundation Liquid Starter Kit, 3 x 250 ml.

    Red Sea Reef Foundation Liquid Starter Kit, 3 x 250 ml.A, B, C Reef Foundation C (Mg): A blend of Magnesium salts. Concentration: 1ml will raise the Mg level of 100 liters (25gal) by 1ppm.Reef Foundation® ACalcium and strontium complex for balanced...

    $32.99
  • Brightwell Aquatics NeoNitro, 2 Liters / 67.6 oz.

    Brightwell Aquatics

    Brightwell Aquatics NeoNitro, 2 Liters / 67.6 oz.

    Brightwell Aquatics NeoNitro, Balanced Nitrogen Source for Nitrogen-Limited, Low-Nutrient Reef Aquaria Used in conjunction with MICROBACTER7 and REEF BIOFUEL or KATALYST, enables natural phosphorus uptake to take place in systems with inadequate...

    $32.95
  • Brightwell Aquatics NeoPhos, 2 Liters / 67.6 oz.

    Brightwell Aquatics

    Brightwell Aquatics NeoPhos, 2 Liters / 67.6 oz.

    Brightwell Aquatics NeoPhos, 2 Liters / 67.6 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,...

    $32.95
  •  Boyd's Chemi-Clean 6 Gr.

    Boyd Enterprises

    Boyd's Chemi-Clean 6 Gr.

    Boyd's ChemiClean 6 Gr. 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 reef systems. It’s...

    $32.24
  •  Triton Bromine Supplement, 1,000ml.   Triton Bromine Supplement, 1,000ml.

    Triton

    Triton Bromine Supplement, 1,000ml.

    Triton Bromine Supplement, 1,000ml The Triton System is based on accurate ICP-OES Testing that tells you exactly how much of any element may be in your aquarium allowing you to keep a healthy, sustainable reef ecosystem. Triton's testing and dosing...

    $32.00
  • Triton Boron Supplement, 1000ml Triton Boron Supplement, 1000ml

    Triton

    Triton Boron Supplement, 1000ml

    Triton Boron Supplement, 1000ml The Triton System is based on accurate ICP-OES Testing that tells you exactly how much of any element may be in your aquarium allowing you to keep a healthy, sustainable reef ecosystem. Triton's testing and dosing...

    $32.00
  • Triton Calcium Supplement, 1000ml Triton Calcium Supplement, 1000ml

    Triton

    Triton Calcium Supplement, 1000ml

    Triton Calcium Supplement, 1000ml The Triton System is based on accurate ICP-OES Testing that tells you exactly how much of any element may be in your aquarium allowing you to keep a healthy, sustainable reef ecosystem. Triton's testing and dosing...

    $32.00
  • Triton Chromium Supplement, 100ml Triton Chromium Supplement, 100ml

    Triton

    Triton Chromium Supplement, 100ml

    Triton Chromium Supplement, 100ml The Triton System is based on accurate ICP-OES Testing that tells you exactly how much of any element may be in your aquarium allowing you to keep a healthy, sustainable reef ecosystem. Triton's testing and dosing...

    $32.00
  • Triton Cobalt Supplement, 100ml Triton Cobalt Supplement, 100ml

    Triton

    Triton Cobalt Supplement, 100ml

    Triton Cobalt Supplement, 100ml The Triton System is based on accurate ICP-OES Testing that tells you exactly how much of any element may be in your aquarium allowing you to keep a healthy, sustainable reef ecosystem. Triton's testing and dosing...

    $32.00
  • Triton Iodine Supplement, 100ml Triton Iodine Supplement, 100ml

    Triton

    Triton Iodine Supplement, 100ml

    Triton Iodine Supplement, 100ml The Triton System is based on accurate ICP-OES Testing that tells you exactly how much of any element may be in your aquarium allowing you to keep a healthy, sustainable reef ecosystem. Triton's testing and dosing...

    $32.00
  • Triton Iron Supplement, 100ml Triton Iron Supplement, 100ml Triton Iron Supplement, 100ml Triton Iron Supplement, 100ml Triton Iron Supplement, 100ml

    Triton

    Triton Iron Supplement, 100ml

    Triton Iron Supplement, 100ml The Triton System is based on accurate ICP-OES Testing that tells you exactly how much of any element may be in your aquarium allowing you to keep a healthy, sustainable reef ecosystem. Triton's testing and dosing...

    $32.00
  • Triton Lithium Supplement, 100ml Triton Lithium Supplement, 100ml

    Triton

    Triton Lithium Supplement, 100ml

    Triton Lithium Supplement, 100ml The Triton System is based on accurate ICP-OES Testing that tells you exactly how much of any element may be in your aquarium allowing you to keep a healthy, sustainable reef ecosystem. Triton's testing and dosing...

    $32.00
  • Triton Magnesium Supplement, 1000ml Triton Magnesium Supplement, 1000ml

    Triton

    Triton Magnesium Supplement, 1000ml

    Triton Magnesium Supplement, 1000ml The Triton System is based on accurate ICP-OES Testing that tells you exactly how much of any element may be in your aquarium allowing you to keep a healthy, sustainable reef ecosystem. Triton's testing and dosing...

    $32.00
  • Triton Manganese Supplement, 100ml. Triton Manganese Supplement, 100ml.

    Triton

    Triton Manganese Supplement, 100ml.

    Triton Manganese Supplement, 100ml The Triton System is based on accurate ICP-OES Testing that tells you exactly how much of any element may be in your aquarium allowing you to keep a healthy, sustainable reef ecosystem. Triton's testing and dosing...

    $32.00
  • Triton Molybdenum Supplement, 100ml Triton Molybdenum Supplement, 100ml

    Triton

    Triton Molybdenum Supplement, 100ml

    Triton Molybdenum Supplement, 100ml The Triton System is based on accurate ICP-OES Testing that tells you exactly how much of any element may be in your aquarium allowing you to keep a healthy, sustainable reef ecosystem. Triton's testing and dosing...

    $32.00
  • Triton Nickel Supplement, 100ml Triton Nickel Supplement, 100ml

    Triton

    Triton Nickel Supplement, 100ml

    Triton Nickel Supplement, 100ml The Triton System is based on accurate ICP-OES Testing that tells you exactly how much of any element may be in your aquarium allowing you to keep a healthy, sustainable reef ecosystem. Triton's testing and dosing...

    $32.00
  • Triton Potassium Supplement, 1000ml. Triton Potassium Supplement, 1000ml.

    Triton

    Triton Potassium Supplement, 1000ml.

    Triton Potassium Supplement, 1000ml The Triton System is based on accurate ICP-OES Testing that tells you exactly how much of any element may be in your aquarium allowing you to keep a healthy, sustainable reef ecosystem. Triton's testing and dosing...

    $32.00
  • Brightwell Aquatics AngeLixir Food Soak, 125 ml./ 4 oz. Brightwell Aquatics AngeLixir Food Soak, 125 ml./ 4 oz.

    Brightwell Aquatics

    Brightwell Aquatics AngeLixir Food Soak, 125 ml./ 4 oz.

    Free-Form Amino Acid Food Soak for Spongivorous Marine Fishes Overview * Complex of free-form amino acids in the same ratios found within tissues of sponges. * Utilizes natural attractants and marine-derived proteins to improve feeding response and...

    $31.95
  • Brightwell Aquatics Koralle-VM, 500 ml. / 17 oz.

    Brightwell Aquatics

    Brightwell Aquatics Koralle-VM, 500 ml. / 17 oz.

    Unique vitamin and minor and trace element complex for establishing and replacing substances importantto marine invertebrates...Brightwell Aquatics Koralle-VM, 500 ml. / 17 oz.* Unique vitamin and minor and trace element complex for establishing and...

    $31.95
  • Brightwell Aquatics RedoxIClean, 2 Liters / 67.6 oz.

    Brightwell Aquatics

    Brightwell Aquatics RedoxIClean, 2 Liters / 67.6 oz.

    Brightwell Aquatics RedoxIClean, Improves Water Quality in all Reef, Marine and Freshwater AquariaBrightwell Aquatics RedoxIClean, 2 Liters / 67.6 oz.OverviewImmediately improves water quality in all manner of aquaria by enhancing the rate of particulate...

    $31.95