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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.

  • Metronidazole - Treats 200 Gallons

    AquaLife

    Metronidazole - Treats 200 Gallons

    Metronidazole - Treats 200 Gallons AquaLife Metronidazole- Treats 200 or 1000 GallonsMetronidazole is effective against:Hole in headHexamitaBody SlimeFreshwater IchDirections: First, dose with AquaLife Complete Water Conditioner. Add 1/8 to 1/4 tsp per...

    $19.99
  • Nitrofurazone – Treats 200 Gallons

    AquaLife

    Nitrofurazone – Treats 200 Gallons

    Nitrofurazone – Treats 200 Gallons Effective Against: -Red Areas and Body Streaks -Peeling or White Body -Open Ulcers -Wasting Away -Bacterial Infections -Ammonia Exposure -For Ornamental Fish Use Only -Not For Human Consumption – use only...

    $19.99
  • Oxytetracycline – Treats 200 Gallons

    AquaLife

    Oxytetracycline – Treats 200 Gallons

    Oxytetracycline – Treats 200 Gallons Effective Against: -Raised Scales -Swollen Belly -Swim Bladder Inflammation -Bacterial Infections -Bloody Fins or Scales -For Ornamental Fish Use Only -Not For Human Consumption – use only as directed...

    $19.99
  • Red Sea Aiptasia X, 60 ml. Red Sea Aiptasia X, 60 ml.

    Red Sea

    Red Sea Aiptasia X, 60 ml.

      Red Sea Aiptasia X, 60 ml. In an exciting development for reef-keepers Red Sea has developed a unique patent pending formula to treat the pest anemones Aiptasia sp., Anemonia majano and Boloceroides sp.Red Sea Aiptasia X, 60 ml..**** PRODUCT...

    $19.99
  • 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...

    $19.99
  • Ruby Reef Kick-Ich Pro 16 oz. Ruby Reef Kick-Ich Pro 16 oz.

    Ruby Reef

    Ruby Reef Kick-Ich Pro 16 oz.

    Ruby Reef Kick-Ich Pro 16 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...

    $19.99
  • Ruby Reef Rally Pro 16 oz. Ruby Reef Rally Pro 16 oz.

    Ruby Reef

    Ruby Reef Rally Pro 16 oz.

    Ruby Reef Rally Pro 16 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...

    $19.99
  • Seachem Acid Buffer 600 gr. Seachem Acid Buffer 600 gr.

    Seachem

    Seachem Acid Buffer 600 gr.

    Seachem Acid Buffer 600 gr. 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...

    $19.99
  • Seachem Reef Pack: NPK 3 x 100 lm.

    Seachem

    Seachem Reef Pack: NPK 3 x 100 lm.

    Seachem Reef Pack: NPK 3 x 100 lm. The Reef Pack™ NPK takes reef supplementation to the next level. In many reef aquariums, supplementation with nitrogen, phosphorus, and potassium can enhance coral and macroalgae growth and color. Reef...

    $19.99
  • ASF Reef Shots Magnesium - 24 Shots ASF Reef Shots Magnesium - 24 Shots

    Aquarium Systems

    ASF Reef Shots Magnesium - 24 Shots

    ASF Reef Shots Magnesium - 24 Shots Magnesium is the third most important element in the composition of seawater. It is essential to numerous biological processes such as photosynthesis and cell division. It is also used in the formation of the...

    Was: $23.50
    Now: $19.98
  •  Seachem SureStart Pack 3 x 100mL Pack  Seachem SureStart Pack 3 x 100mL Pack  Seachem SureStart Pack 3 x 100mL Pack

    Seachem

    Seachem SureStart Pack 3 x 100mL Pack

    Seachem SureStart Pack 3 x 100mL Pack Contains 100 mL bottles of Prime, Stability, Pristine Make water safe; remove chlorine, chloramine and ammonia Establish the Bio-filter Eliminate Sludge and Detritus Freshwater and marine HeadStart...

    $19.95
  • ATI ICP Element Barium - 150 mL

    ATI

    ATI ICP Element Barium - 150 mL

    ATI ICP Element Barium - 150 mL ATI ICP Element Barium is a high-purity solution developed to replenish barium in reef aquariums.  Why It’s Important Barium improves coral skeletal development and coloration, particularly in SPS and LPS...

    $19.95
  • ATI ICP Element Chromium - 150 mL

    ATI

    ATI ICP Element Chromium - 150 mL

    ATI ICP Element Chromium - 150 mL restore chromium levels in reef aquariums. Why It’s Important While not widely studied, it is believed that chromium supports metabolic processes in invertebrates and bacterial activity in reef systems...

    $19.95
  • ATI ICP Element Cobalt - 150 mL

    ATI

    ATI ICP Element Cobalt - 150 mL

    ATI ICP Element Cobalt - 150 mL ATI ICP Element Cobalt is a high-purity solution formulated to restore cobalt levels in reef aquariums.  Why It’s Important Cobalt plays a critical role in coral growth, coloration, and fish vitality, making...

    $19.95
  • ATI ICP Element Copper - 150 mL

    ATI

    ATI ICP Element Copper - 150 mL

    ATI ICP Element Copper - 150 mL ATI ICP Element Copper is a high-purity solution for restoring trace levels of copper in reef aquariums. Why It’s Important Copper acts as a cofactor in enzyme processes and supports healthy metabolism in fish and...

    $19.95
  • ATI ICP Element Iron - 150 mL

    ATI

    ATI ICP Element Iron - 150 mL

    ATI ICP Element Iron - 150 mL restore iron levels in reef aquariums. Why It’s Important Iron supports vibrant coral coloration, macroalgae growth, and essential metabolic functions in both corals and invertebrates. Iron is key to photosynthesis...

    $19.95
  • ATI ICP Element Lithium - 150 mL

    ATI

    ATI ICP Element Lithium - 150 mL

    ATI ICP Element Lithium - 150 mL ATI ICP Element Lithium is a high-purity solution used to restore lithium levels in reef aquariums. Why It’s Important Lithium supports enzyme activity and overall biological function in marine systems. Lithium is...

    $19.95
  • ATI ICP Element Manganese - 150 mL

    ATI

    ATI ICP Element Manganese - 150 mL

    ATI ICP Element Manganese - 150 mL ATI ICP Element Manganese is a high-purity solution designed to replenish manganese in reef aquariums. Why It’s Important Manganese plays a vital role in coral coloration, photosynthesis, and enzyme function,...

    $19.95
  • ATI ICP Element Molybdenum - 150 mL

    ATI

    ATI ICP Element Molybdenum - 150 mL

    ATI ICP Element Molybdenum - 150 mL ATI ICP Element Molybdenum is a high-purity trace element supplement that supports biological filtration and nitrogen cycling in reef aquariums. Why It’s Important Molybdenum is essential for denitrification...

    $19.95
  • ATI ICP Element Nickel - 150 mL

    ATI

    ATI ICP Element Nickel - 150 mL

    ATI ICP Element Nickel - 150 mL ATI ICP Element Nickel is a high-purity solution for supplementing trace levels of nickel in reef aquariums. Why It’s Important Nickel is thought to enhance enzyme activity in nitrifying and nitrogen-fixing...

    $19.95
  • ATI ICP Element Rubidium - 150 mL

    ATI

    ATI ICP Element Rubidium - 150 mL

    ATI ICP Element Rubidium - 150 mL ATI ICP Element Rubidium is a high-purity solution designed to restore rubidium levels in reef aquariums. Why It’s Important Rubidium is believed to play a role in the health and coloration of corals,...

    $19.95
  • ATI ICP Element Selenium - 150 mL

    ATI

    ATI ICP Element Selenium - 150 mL

    ATI ICP Element Selenium - 150 mL ATI ICP Element Selenium is a high-purity solution designed to restore selenium levels in reef aquariums. Why It’s Important Selenium enhances coral health by supporting antioxidant defenses, particularly under...

    $19.95
  • ATI ICP Element Vanadium - 150 mL

    ATI

    ATI ICP Element Vanadium - 150 mL

    ATI ICP Element Vanadium - 150 mL ATI ICP Element Vanadium is a high-purity trace element supplement used to restore vanadium levels in reef aquariums. Why It’s Important Vanadium supports coral coloration, sponge growth, and overall metabolic...

    $19.95
  • ATI ICP Element Zinc - 150 mL

    ATI

    ATI ICP Element Zinc - 150 mL

    ATI ICP Element Zinc - 150 mL ATI ICP Element Zinc is a high-purity solution formulated to restore zinc levels in reef aquariums. Why It’s Important Zinc boosts coloration, zooxanthellae activity, and tissue repair in corals, and improves healing...

    $19.95
  • BlueLife Fish Flux-Rx 100 gal / 2000 mg BlueLife Fish Flux-Rx 100 gal / 2000 mg

    BlueLife Fish Flux-Rx 100 gal / 2000 mg

    BlueLife Flux Rx 350 gal / 7000 mg FishFlux Rx is an antifungal medication used to treat topical and systemic fungal infections in ornamental fish. It is used in aquariums for the treatment of fungus susceptible to Fluconazole like Ichthyophonus...

    $19.95
  • BlueLife Flux-Rx 100 gal / 2000 mg BlueLife Flux-Rx 100 gal / 2000 mg

    BlueLife Flux-Rx 100 gal / 2000 mg

    BlueLife Flux Rx 100 gal / 2000 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...

    $19.95
  • 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...

    $19.95
  • MIRACLE MUD Freshwater, 2 lbs. by EcoSystem Aquarium MIRACLE MUD Freshwater, 2 lbs. by EcoSystem Aquarium MIRACLE MUD Freshwater, 2 lbs. by EcoSystem Aquarium MIRACLE MUD Freshwater, 2 lbs. by EcoSystem Aquarium

    EcoSystem Aquarium

    MIRACLE MUD Freshwater, 2 lbs. by EcoSystem Aquarium

    MIRACLE MUD Freshwater, 2 lbs. by EcoSystem Aquarium Miracle Mud is a product of EcoSystem Aquarium® that has been carefully formulated to include all the essential trace elements, minerals, and components necessary to maintain a successful aquarium...

    $19.95
  • Seachem Cupramine Cooper Treatment 250 ml. Seachem Cupramine Cooper Treatment 250 ml.

    Seachem

    Seachem Cupramine Cooper Treatment 250 ml.

    Seachem Cupramine Cooper Treatment 250 ml. Effectively eradicates Oodinium, Cryptocaryon, Amyloodinium, Ichthyophthirius, and other ectoparasites of both freshwater and marine fish. It is non-acidic, less toxic to fish, remains in solution, and does not...

    $19.95
  • 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
  • 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...

    $19.67
  • 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...

    $19.67
  • Brightwell Aquatics BoroChrom, 2 Liters / 67.6 oz.

    Brightwell Aquatics

    Brightwell Aquatics BoroChrom, 2 Liters / 67.6 oz.

    Brightwell Aquatics BoroChrom, Concentrated Boron Solution for Improved Coralline Growth & Red Coloration in ZooxanthellateIn natural seawater, boron is a non-conservative major element with a concentration of ~4.54 ppm. Boron plays an active role in...

    Was: $22.95
    Now: $19.51
  • Brightwell Aquatics Restor,  500 ml. / 17 oz..

    Brightwell Aquatics

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

    * Encourages health, growth, reproduction, and vibrant coloration. * Provides important nutrients to corals and their allies during periods of stress induced by changes in lighting and/or prolonged exposure to excessive water temperature (often resulting...

    Was: $22.95
    Now: $19.51
  • ATI Elements Bromine Supplement - 1000 ml.

    ATI

    ATI Elements Bromine Supplement - 1000 ml.

    ATI Bromine Supplement - 1000 ml. Bromine is used in some corals for chromoprotein synthesis and for skeleton construction. The ATI Elements Bromine Supplement for Reef Aquariums is available in a 1,000 ml bottle. ATI Water Testing and...

    Was: $22.95
    Now: $19.50
  • ATI Elements Calcium Supplement - 1000 ml. ATI Elements Calcium Supplement - 1000 ml.

    ATI

    ATI Elements Calcium Supplement - 1000 ml.

    ATI Calcium Supplement - 1000 ml. Calcium is a crucial element for stony corals, clams, and calcareous algae. The ATI Elements Calcium Supplement for Reef Aquariums is available in a 1,000 ml bottle. ATI Water Testing and Treatment ATI’s...

    Was: $22.95
    Now: $19.50
  • ATI Elements Iodine Supplement - 1000 ml.

    ATI

    ATI Elements Iodine Supplement - 1000 ml.

    ATI Iodine Supplement - 1000 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 1000 ml bottle. ATI Water Testing and...

    Was: $22.95
    Now: $19.50
  • ATI Elements Magnesium Supplement - 1000 ml. ATI Elements Magnesium Supplement - 1000 ml.

    ATI

    ATI Elements Magnesium Supplement - 1000 ml.

    ATI Magnesium Supplement - 1000 ml. Magnesium aids in the regulation of aquarium PH and the formation of skeletal structures in invertebrates. The ATI Elements Magnesium Supplement for Reef Aquariums is available in a 1,000 ml bottle. ATI Water...

    Was: $22.95
    Now: $19.50
  • ATI Elements Potassium Supplement - 1000 ml. ATI Elements Potassium Supplement - 1000 ml.

    ATI

    ATI Elements Potassium Supplement - 1000 ml.

    ATI Potassium Supplement - 1000 ml. Potassium is an essential element in both the skeletal construction and coloration of certain corals. The ATI Elements Potassium Supplement for Reef Aquariums is available in a 1,000 ml bottle. ATI Water Testing...

    Was: $22.95
    Now: $19.50
  • 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...

    $19.49
  • 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 -...

    $19.39