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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 Pristine 500 ml. Seachem Pristine 500 ml.

    Seachem

    Seachem Pristine 500 ml.

    Seachem Pristine 500 ml. Description Pristine� uses bio-augmentation, a non-chemical and natural method, to improve water quality. It provides bacteria that break down excess food, waste and detritus in freshwater and marine systems. It will also...

    $19.95
  • Seachem Reef Advantage Magnesium, 1,200 gr. Seachem Reef Advantage Magnesium, 1,200 gr.

    Seachem

    Seachem Reef Advantage Magnesium, 1,200 gr.

    Reef Advantage Magnesium is a concentrated (80,000 ppm) optimized blend of magnesium, chloride, and sulfate salts designed to restore depleted levels of magnesium...Seachem Reef Advantage Magnesium, 1,200 gr.Reef Advantage Magnesium™ is a...

    $19.95
  • Seachem Reef Dip 500 ml 17 fl. oz.. Seachem Reef Dip 500 ml 17 fl. oz..

    Seachem

    Seachem Reef Dip 500 ml 17 fl. oz..

    Seachem Reef Dip 500 ml 17 fl. oz. Reef Dip™ contains elemental iodine complexed to a protective slime coat for safely and gently disinfecting corals.It is effective against bacteria, fungus, and protozoans. It may be used prophylactically...

    $19.95
  • Two Little Fishes SeaElements 250ml.

    Two Little Fishes

    Two Little Fishes SeaElements 250ml.

    No Description AvailableIndependent studies show that some trace elements accumulate in home aquariums to potentially toxic levels. SeaElements avoids contributing to this problem by including only those elements that are typically depleted from aquarium...

    $19.52
  • Tropic Marin Potassium 500mL

    Tropic Marin

    Tropic Marin Potassium 500mL

    Tropic Marin Potassium 500mL Maintain vibrant coral coloration and health with Tropic Marin's Potassium supplement Potassium is an essential main nutrient for all organisms. In seawater the natural potassium concentration is approximately 408 ppm...

    $19.07
  • Hikari IntestiPro 3.5oz - Treats 200 Gallons Hikari IntestiPro 3.5oz - Treats 200 Gallons

    Hikari

    Hikari IntestiPro 3.5oz - Treats 200 Gallons

    Hikari IntestiPro 3.5oz - Treats 200 Gallons IntestiPro® is a powdered formula that was developed to offer the hobbyist an effective way to treat intestinal worm issues suffered by their pond, freshwater, or marine fishes. This revolutionary, extremely...

    $18.99
  • Tropic Marin Pro Coral Reef Snow, 100 ml. Tropic Marin Pro Coral Reef Snow, 100 ml.

    Tropic Marin

    Tropic Marin Pro Coral Reef Snow, 100 ml.

    Tropic Marin Pro Coral Reef Snow, 100 ml. A natural source of nutrients for corals and other filter feeding animals Ability to vary the particulate size to cater towards specific filter feeding animals Helps in reef aquaria as a food source for a...

    $18.98
  • ATI Elements Chromium Supplement - 100 ml.

    ATI

    ATI Elements Chromium Supplement - 100 ml.

    ATI Chromium Supplement - 100 ml. Chromium can aid in producing improved coral coloration and better health. The ATI Elements Chromium Supplement for Reef Aquariums is available in a 100 ml bottle. ATI Water Testing and Treatment ATI’s line...

    $18.95
  • ATI Elements Iron Supplement - 100 ml.

    ATI

    ATI Elements Iron Supplement - 100 ml.

    ATI Iron Supplement - 100 ml. Iron benefits photosynthetic invertebrates and plants and provides nourishment for improved color and growth. The ATI Elements Iron Supplement for Reef Aquariums is available in a 100 ml bottle. ATI Water Testing and...

    $18.95
  • ATI Elements Lithium Supplement - 100 ml. ATI Elements Lithium Supplement - 100 ml.

    ATI

    ATI Elements Lithium Supplement - 100 ml.

    ATI Lithium Supplement - 100 ml. Lithium helps to produce brighter corals in your aquarium. The ATI Elements Lithium Supplement for Reef Aquariums is available in a 100 ml bottle. ATI Water Testing and Treatment ATI’s line of water...

    $18.95
  • ATI Elements Manganese Supplement - 100 ml

    ATI

    ATI Elements Manganese Supplement - 100 ml.

    ATI Manganese Supplement - 100 ml. Manganese is an element used in the process of photosynthesis. The ATI Elements Manganese Supplement for Reef Aquariums is available in a 100 ml bottle. ATI Water Testing and Treatment ATI’s line of water...

    $18.95
  • ATI Elements Molybdenum Supplement - 100 ml. ATI Elements Molybdenum Supplement - 100 ml.

    ATI

    ATI Elements Molybdenum Supplement - 100 ml.

    ATI Molybdenum Supplement - 100 ml. In small quantities, Molybdenum aids the biological processes of many beneficial strains of bacteria. The ATI Elements Molybdenum Supplement for Reef Aquariums is available in a 100 ml bottle. ATI Water Testing...

    $18.95
  • ATI Elements Vanadium Supplement - 100 ml. ATI Elements Vanadium Supplement - 100 ml.

    ATI

    ATI Elements Vanadium Supplement - 100 ml.

    ATI Vanadium Supplement - 100 ml. Certain sponges accumulate Vanadium, and this element helps them to establish and grow. The ATI Elements Vanadium Supplement for Reef Aquariums is available in a 100 ml bottle. ATI Water Testing and...

    $18.95
  • ATI Elements Zinc Supplement - 100 ml. ATI Elements Zinc Supplement - 100 ml.

    ATI

    ATI Elements Zinc Supplement - 100 ml.

    ATI Zinc Supplement - 100 ml. Zinc activates certain enzymes that promote better transfer of carbon dioxide in organisms. It also aids plants in leaf formation. The ATI Elements Zinc Supplement for Reef Aquariums is available in a 100 ml bottle...

    $18.95
  • BlueLife Red Cyano-Rx BlueLife Red Cyano-Rx

    BlueLife Red Cyano-Rx

    BlueLife Red Cyano Rx Red Cyano Rx will quickly and effectively treat disease causing Cyano bacteria from live rock, live coral and live sand in your saltwater aquarium without harming any of its inhabitants including beneficial bacteria when used as...

    $18.95
  • Brightwell Aquatics Florin Delta KH+ 500 g. Brightwell Aquatics Florin Delta KH+ 500 g.

    Brightwell Aquatics

    Brightwell Aquatics Florin Delta KH+ 500 g.

    Brightwell Aquatics Florin Delta KH+ 500 g. Increases Carbonate Hardness in all Freshwater and Planted Aquarua   Increases alkalinity (a.k.a. carbonate hardness or buffering capacity) infreshwater aquaria with a target pH of 7.8 or less...

    $18.95
  • ESV Bionic Calcium Buffer System, 2 x 16 oz. ESV Bionic Calcium Buffer System, 2 x 16 oz.

    E.S.V.

    ESV Bionic Calcium Buffer System, 2 x 16 oz.

    ESV Bionic Calcium Buffer System, 2 x 16 oz. 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 alkalinity levels...

    $18.95
  • Two Little Fishes BioPronto Marine, 8 oz.

    Two Little Fishes

    Two Little Fishes BioPronto Marine, 8 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...

    $18.54
  •  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...

    $18.50
  • 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...

    $18.50
  • 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...

    $18.50
  • Red Sea KH Coralline Gro, 500 ml Red Sea KH Coralline Gro, 500 ml

    Red Sea

    Red Sea KH Coralline Gro, 500 ml

    Red Sea KH Coralline Gro, 500 ml Coralline algae will grow naturally, without any special supplements in all reef systems optimized for hard corals.  KH Coralline Gro is a complex of carbonate buffers, potassium and trace elements such as iron,...

    Was: $19.99
    Now: $17.99
  • API EM Erythromycin Powder Packets, 10ct.

    API

    API EM Erythromycin Powder Packets, 10ct.

    API EM Erythromycin Powder Packets, 10ct. For broad spectrum treatment and control of bacterial disease, such as body slime, mouth fungus, Furunculosis (open lesions and swelling), bacterial gill disease and hemorrhagic septicemia (blood spots without...

    $17.95
  • Brightwell Aquatics Koralle-VM, 250 ml. / 8.5 oz.

    Brightwell Aquatics

    Brightwell Aquatics Koralle-VM, 250 ml. / 8.5 oz.

    Unique vitamin and minor and trace element complex for establishing and replacing substances importantto marine invertebrates...Brightwell Aquatics Koralle-VM, 250 ml. / 8.5 oz.* Unique vitamin and minor and trace element complex for establishing...

    $17.95
  • Brightwell Aquatics RedoxIClean,, 500 ml. / 17 oz.

    Brightwell Aquatics

    Brightwell Aquatics RedoxIClean,, 500 ml. / 17 oz.

    Brightwell Aquatics RedoxIClean, Improves Water Quality in all Reef, Marine and Freshwater AquariaBrightwell Aquatics RedoxIClean, Improves Water Quality in all Reef, Marine and Freshwater Aquaria, 500 ml. / 17 oz.OverviewImmediately improves water...

    $17.95
  • 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...

    $17.95
  • Tropic Marin Coral Clean 250 ml. Tropic Marin Coral Clean 250 ml.

    Tropic Marin

    Tropic Marin Coral Clean 250 ml.

    Tropic Marin Coral Clean 250 ml. Tropic Marin Coral Clean is an iodine dip for corals to prevent the unwanted introduction of parasites and/or impurities into your reef aquarium. The Coral Clean solution is phosphate-free and less aggressive than...

    $17.89
  • Tropic Marin Nitribiotic 50mL

    Tropic Marin

    Tropic Marin Nitribiotic 50mL

    Tropic Marin Nitribiotic 50mL Tropic Marin® Nitribiotic is a combination of probiotic and nitrifying bacteria in one preparation which activate the immune systems of fish and shrimp and improves the water quality. The nitrifying bacteria...

    $17.89
  • Tropic Marin BIO-MAGNESIUM, 16 oz. Tropic Marin BIO-MAGNESIUM, 16 oz.

    Tropic Marin

    Tropic Marin BIO-MAGNESIUM, 16 oz.

    Tropic Marin BIO-MAGNESIUM, 16 oz. Tropic Marin Bio-Magnesium is biologically ideal Magnesium Supplement for Reef Aquariums. A sufficient supply of magnesium is as essential for the growth and well being of reef building coralline algae as calcium...

    $17.72
  • API Algaefix Freshwater, 16 oz.

    API

    API Algaefix Freshwater, 16 oz.

    API Algaefix Freshwater, 16 oz.A revolutionary new product specially developed to control many types of algae in freshwater aquariums containing live plants. Effectively controls green water algae blooms. Keeps freshwater aquariums clean and clear. Can...

    $16.98
  • Brightwell Aquatics Frag Recover, 500 ml. Brightwell Aquatics Frag Recover, 500 ml.

    Brightwell Aquatics

    Brightwell Aquatics Frag Recover, 500 ml.

    Brightwell Aquatics Frag Recover, 500 ml. natural herbal dip to prevent infection of fragmented coral pieces Overview All-Natural, herbal frag dip to accelerate coral recovery and growth after fragging. Helps prevent disease transfer into the...

    Was: $19.95
    Now: $16.96
  • API General Cure Powder Packets, 10ct.

    API

    API General Cure Powder Packets, 10ct.

    API General Cure Powder Packets, 10ct.Treats a wide variety of parasitic diseases including velvet, anchor worm, fish lice, hole-in-the-head disease (Hexamita spp. & Spironucleus spp.), gill & skin flukes (Dactylogyrus spp. & Gyrodactylus...

    $16.95
  • Brightwell Aquatics Michrobacter START XLM 125 ml. Brightwell Aquatics Michrobacter START XLM 125 ml.

    Brightwell Aquatics

    Brightwell Aquatics Michrobacter START XLM 125 ml.

    Brightwell Aquatics Michrobacter START XLM 125 ml. Professional 15x strength live tank starter nitrifying bioculture for rapidly cycling new marine fish and reef aquaria and brackish aquariums, and for recovering from overcrowding or disasters where the...

    $16.95
  • Salifert Flat Worm Exit

    Salifert

    Salifert Flat Worm Exit

    Salifert Flat Worm Exit.Salifert Flatworm Exit is a safe solution to get rid of flatworms in your tank. It is perfectly harmless for the reef inhabitants, both fish and invertebrates, but definitely deadly for the flatworms. Flatworm body juice can...

    $16.95
  • Seachem Reef Advantage Calcium, 500 gr. Seachem Reef Advantage Calcium, 500 gr.

    Seachem

    Seachem Reef Advantage Calcium, 500 gr.

    Seachem Reef Advantage Calcium, 500 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 essential...

    $16.95
  •  Tropic Marin BIO-CALCIUM, 16 oz.  Tropic Marin BIO-CALCIUM, 16 oz.

    Tropic Marin

    Tropic Marin BIO-CALCIUM, 16 oz.

    Tropic Marin BIO-CALCIUM, 16 oz. Tropic Marin Bio-Calcium Enables the addition of biologically ideal calcium to the reef aquarium:All calcareous animals, especially corals need calcium and carbonates to grow and flourish. However the growth rate of...

    $16.58
  • Two Little Fishes Bactiv8 NPX, 500 ml.

    Two Little Fishes

    Two Little Fishes Bactiv8 NPX, 500 ml.

    Two Little Fishes Bactiv8 NPXTwo Little Fishies Bactiv8 NPX promotes healthy biological filtration by enhancing nitrification and denitrification, as well as promoting the decomposition of organic waste in heavily stocked aquariums. Bactiv8 contains...

    $16.26
  •  Boyd's Chemi-Clean 2 Gr.

    Boyd Enterprises

    Boyd's Chemi-Clean 2 Gr.

    Boyd's ChemiClean 2 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...

    $15.99
  • DrTim's Aquatics MARINE Clear-Up 8oz. DrTim's Aquatics MARINE Clear-Up 8oz.

    Dr. Tim's Aquatics

    DrTim's Aquatics MARINE Clear-Up 8oz.

    DrTim's Aquatics MARINE Clear-Up 8oz. 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...

    $15.99
  • Red Sea DipX Coral Dip 250ml Red Sea DipX Coral Dip 250ml Red Sea DipX Coral Dip 250ml

    Red Sea

    Red Sea DipX Coral Dip 250ml.

    Red Sea DipX Coral Dip 250ml. DipX is a highly effective dip for safely introducing new corals and live rocks to your aquarium. Features- Safe for all kinds of corals: SPS, LPS and Soft corals, Zoanthids, mushroom anemones (Discosoma and Ricordea) and...

    $15.99
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