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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 Reef Nitrogen 500mL

    Seachem

    Seachem Reef Nitrogen 500mL

    Seachem Reef Nitrogen 500mL Nitrogen is an essential element required in metabolic processes, protein synthesis, and growth of corals and macroalgae. Research suggests a tightly closed nitrogen cycle on reefs where concentrations are higher in...

    $12.99
  • Seachem Reef Phosphorus 500mL

    Seachem

    Seachem Reef Phosphorus 500mL

    Seachem Reef Phosphorus 500mL Phosphorus is an essential element required in metabolic processes, protein synthesis, and growth of corals and macroalgae. It is important to maintain phosphorus levels along with nitrogen levels in order to allow for...

    $12.99
  • Seachem Reef Potassium 500mL

    Seachem

    Seachem Reef Potassium 500mL

    Seachem Reef Potassium 500mL Potassium is an essential element required in metabolic processes, protein synthesis, and growth of corals and macroalgae. In systems supported with nitrogen and phosphorus supplementation, potassium utilization rates may be...

    $12.99
  • Seachem Garlic Guard, 500ml

    Seachem

    Seachem Garlic Guard, 500ml.

    Garlic Guard is an appetite/flavor enhancer for freshwater and saltwater fish. GarlicGuard will help renew the interest of poor or finicky eaters. GarlicGuard contains the naturally derived, active ingredient found in garlic, allicin, which has been...

    $12.95
  • Brightwell Aquatics Restor, 250 ml. / 8.5 oz

    Brightwell Aquatics

    Brightwell Aquatics Restor, 250 ml. / 8.5 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...

    $12.95
  • Brightwell Aquatics Vitamarin-C, 125 ml. / 4 oz.

    Brightwell Aquatics

    Brightwell Aquatics Vitamarin-C, 125 ml. / 4 oz.

    Unique vitamin and minor and trace element complex for establishing and replacing substances importantto marine invertebrates...Brightwell Aquatics Vitamarin-C, 125 ml. / 4 oz.* Highly-concentrated vitamin-C solution. * Buffered; will not impact pH when...

    $12.95
  • Seachem Cupramine Cooper Treatment 100 ml. Seachem Cupramine Cooper Treatment 100 ml.

    Seachem

    Seachem Cupramine Cooper Treatment 100 ml.

    Seachem Cupramine Cooper Treatment 100 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...

    $12.95
  • Seachem Reef Advantage Magnesium, 600 gr. Seachem Reef Advantage Magnesium, 600 gr.

    Seachem

    Seachem Reef Advantage Magnesium, 600 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, 600 gr.Reef Advantage Magnesium™ is a...

    $12.95
  • BlueLife Aiptasia Rx

    BlueLife

    BlueLife Aiptasia Rx

    BlueLife Aiptasia Rx Aiptasia Rx is a simple, effective and rapid solution for treating Aiptasia and Majano anemones. This product yields results within minutes of application. The dense solution sticks to Aiptasia, sealing the mouth to ensure planulas...

    $12.92
  • Seachem Safe 250 gr. Seachem Safe 250 gr.

    Seachem

    Seachem Safe 250 gr.

    Seachem Safe 250 gr. 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...

    $12.73
  • 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...

    Was: $14.95
    Now: $12.71
  • 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...

    Was: $14.50
    Now: $12.33
  • 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...

    MSRP: $18.99
    Was: $14.24
    Now: $12.10
  • DrTim's Aquatics Ammonium Chloride, 8oz.

    Dr. Tim's Aquatics

    DrTim's Aquatics Ammonium Chloride, 8oz.

    DrTim's Aquatics Ammonium Chloride, 8oz. Ammonia for fishless cyclingOne of our most popular products is our Ammonium Chloride for fishless cycling. As the term implies fishless cycling means without fish but there needs to be a source of ammonia for...

    $11.99
  •  Seachem Reef Complete, 500 ml.   Seachem Reef Complete, 500 ml.

    Seachem

    Seachem Reef Complete, 500 ml.

    Reef Complete is a concentrated (160,000 mg/L) optimized blend of ionic calcium designed to restore and maintain calcium to levels found in natural seawater without affecting pH...Seachem Reef Complete, 500 ml.Reef Complete™ is a concentrated...

    $11.95
  • Seachem Reef Advantage Strontium 600 gr. Seachem Reef Advantage Strontium 600 gr.

    Seachem

    Seachem Reef Advantage Strontium 600 gr.

    Seachem Reef Advantage Strontium 600 gr. Reef Advantage Strontium™ restores and maintains strontium to levels found in natural sea water. Strontium is utilized by corals in the same manner as calcium and holds a similar importance in...

    $11.95
  • Seachem Reef Strontium 500 ml. Seachem Reef Strontium 500 ml.

    Seachem

    Seachem Reef Strontium 500 ml.

    Reef Strontium is intended to restore and maintain strontium to levels found in natural seawater without affecting pH. Strontium is utilized in the same manner as calcium and holds a similar importance in maintaining a vigorous level of growth.Reef...

    $11.95
  • Seachem Reef Trace 500 ml. Seachem Reef Trace 500 ml.

    Seachem

    Seachem Reef Trace 500 ml.

    Seachem Reef Trace 500 ml. Reef Trace supplies a broad range of trace elements demonstrated to be necessary for proper reef health and growth.Trace elements are normally depleted by utilization, oxidation and precipitation. The latter two processes...

    $11.95
  •  Seachem Reef Plus, 500 ml.   Seachem Reef Plus, 500 ml.

    Seachem

    Seachem Reef Plus, 500 ml.

    Seachem Reef Plus, 500 ml. SeaChem Reef Plus ™ is a full spectrum reef supplement containing trace elements, vitamins, and amino acids demonstrated to have a positive impact on the growth of corals and other desirable reef creatures. Reef...

    $11.92
  • 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...

    Was: $13.95
    Now: $11.86
  • 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...

    Was: $13.95
    Now: $11.86
  • Two Little Fishes Calcium Concentrate 500ml.

    Two Little Fishies

    Two Little Fishes Calcium Concentrate 500ml.

    Two Little Fishes Calcium Concentrate 500ml.   Two Little Fishies Calcium Concentrate Julian Sprungs Reef Formula makes it easy to rapidly adjust the calcium level in an aquarium. The long-term maintenance of calcium levels is best managed with a...

    $11.63
  • Seachem Marine Buffer 500 gr. Seachem Marine Buffer 500 gr.

    Seachem

    Seachem Marine Buffer 500 gr.

    Seachem Marine Buffer 500 gr.Marine Buffer will safely raise marine pH to 8.3. It will not raise pH above 8.3 even if inadvertently overdosed. Marine Buffer is a blended product and is not just sodium bicarbonate or sodium carbonate, commonly sold...

    $11.55
  • Seachem Reef Calcium, 500 ml. Seachem Reef Calcium, 500 ml.

    Seachem

    Seachem Reef Calcium, 500 ml.

    Seachem Reef Calcium, 500 ml.Reef Calcium™ is a concentrated (50,000 mg/L) bioavailable polygluconate complexed calcium intended to maintain calcium in the reef aquarium without altering pH. Polygluconate complexation confers several benefits: it...

    $11.55
  • Seachem Reef Iodine 500 ml. Seachem Reef Iodine 500 ml.

    Seachem

    Seachem Reef Iodine 500 ml.

    Seachem Reef Iodine 500 ml. Reef Iodide is a concentrated (8,000 mg/L) stabilized potassium iodide source for reef aquaria that will restore and maintain iodide levels to those found in natural sea water. It is formulated to provide a safe source...

    $11.47
  • ESV Potassium Iodide, 16 oz. ESV Potassium Iodide, 16 oz.

    E.S.V.

    ESV Potassium Iodide, 16 oz.

    ESV Potassium Iodide, 16 oz. Iodide is an important micro-nutrient for many marine plants. ESV Potassium Iodide Solution is a highly soluble form of inorganic iodide which makes it great for maintaining dissolved iodide levels in your saltwater tank...

    Was: $12.95
    Now: $11.01
  • Hikari Metro+ 3.5 oz - Treats 100 gallons Hikari Metro+ 3.5 oz - Treats 100 gallons

    Hikari

    Hikari Metro+ 3.5 oz - Treats 100 gallons

    Hikari Metro+ Multi Purpose Treatment 3.5 oz. Effective treatment, containing Metronidazole, to help treat hole-in-the-head and lateral line disease. It has a slime-coat replacer to accelerate the healing of infected external regions for freshwater,...

    $10.99
  • Seachem Reef Carbonate 500 ml. Seachem Reef Carbonate 500 ml.

    Seachem

    Seachem Reef Carbonate 500 ml.

    Reef Carbonate is a concentrated (4,000 meq/L) optimized blend of carbonate and bicarbonate salts designed to restore and maintain alkalinity in the reef aquarium...Reef Carbonate is a concentrated (4,000 meq/L) optimized blend of carbonate and...

    $10.99
  • UltraLife Red Slime Stain Remover NANO Treats 25 Gal UltraLife Red Slime Stain Remover NANO Treats 25 Gal

    UltraLife

    UltraLife Red Slime Stain Remover NANO Treats 25 Gal

    UltraLife Red Slime Stain Remover NANO Treats 25 Gal Keep your aquarium clean and clear with the Ultralife Red Slime Stain Remover Nano Aquarium Cleaner. Formulated with a special blend of natural cellular matter, select biological accelerators and...

    $10.95
  • DrTim's Aquatics MARINE First Defense 4oz. DrTim's Aquatics MARINE First Defense 4oz.

    Dr. Tim's Aquatics

    DrTim's Aquatics MARINE First Defense 4oz.

    DrTim's Aquatics MARINE First Defense 4oz. 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...

    $10.59
  •  Fritz Mardel Maracyn Oxy 4 oz.   Fritz Mardel Maracyn Oxy 4 oz.

    Fritz

    Fritz Mardel Maracyn Oxy 4 oz.

    Fritz Mardel Maracyn Oxy 4 Oz. For infections of: True fungal infections on fish and eggs (whitish tufts of cotton-like material) and bacterial diseases. Maracyn®Oxy successfully controls fungus infections caused by Saprolegnia,...

    $10.19
  • ESV Strontium Chloride Solution (20%), 16 oz. ESV Strontium Chloride Solution (20%), 16 oz.

    E.S.V.

    ESV Strontium Chloride Solution (20%), 16 oz.

    ESV Strontium Chloride Solution (20%), 16 oz. Maintain dissolved strontium chloride levels in your saltwater aquarium. Strontium chloride, like calcium chloride, has the potential to lower alkalinity levels after prolonged use. Be sure to monitor...

    Was: $11.95
    Now: $10.16
  • Joes Juice Stop Aiptasia Kit Joes Juice Stop Aiptasia Kit

    Joes Juice

    Joes Juice Stop Aiptasia Kit

    Joes Juice Stop Aiptasia Kit Joes Juice is an easy to use Reef safe Aiptasia Solution. Simply feed the anemone a small amount of Joes Juice and watch the results within minutes. Joes juice is available worldwide since 2003.· Reef Safe· Feeding Aiptasia...

    $9.99
  • Seachem Kanaplex 5g

    Seachem

    Seachem Kanaplex 5g

    Seachem Kanaplex 5g KanaPlex is a blended kanamycin based medication that safely and effectively treats several fungal, and bacterial fish diseases (dropsy, popeye, fin/tail rot, septicemica). Because it is absorbed by fish it is useful in treating...

    $9.99
  • Seachem Metroplex 5 gr. Seachem Metroplex 5 gr.

    Seachem

    Seachem Metroplex 5 gr.

    Seachem Metroplex 5 gr. Metronidazole is an effective and safe treatment for several protozoan and anaerobic bacterial diseases of fish (Cryptocaryon, Hexamita, Ichthyophthirius). It does not adversely affect the filter bed and is easily removed with...

    $9.99
  • Seachem NeoPlex 10g

    Seachem

    Seachem NeoPlex 10g

    Seachem NeoPlex 10g NeoPlex is a broad spectrum antibiotic effective against most external infections of both marine and freshwater fish. Used as directed, NeoPlex will not discolor the water or damage the filter bed. It is well tolerated by...

    $9.99
  • Seachem PolyGuard 10g

    Seachem

    Seachem PolyGuard 10g

    Seachem PolyGuard 10g PolyGuard is the single most effective medication to keep freshwater fish free of disease! It is an effective treatment and safeguard against all prevalent bacterial, fungal, and parasitic diseases of exotic fish. For use in...

    $9.99
  • Seachem SulfaPlex 10 gr.

    Seachem

    Seachem SulfaPlex 10 gr.

    Seachem SulfaPlex 10 gr. Treats many bacterial, fungal, and protozoan infestations Broad-spectrum antibiotic and anti-fungal medication Most effective of the sulfa drugs in saltwater Absorbed through gills SulfaPlex™ is an effective and safe...

    $9.99
  • Brightwell Aquatics BoroChrom, 500 ml. / 17 oz.

    Brightwell Aquatics

    Brightwell Aquatics BoroChrom, 500 ml. / 17 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...

    $9.95
  • ESV Calcium Chloride, 400 gr. ESV Calcium Chloride, 400 gr.

    E.S.V.

    ESV Calcium Chloride, 400 gr.

    ESV Calcium Chloride, 400 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: $10.95
    Now: $9.31
  • Two Little Fishes Bactiv8 NPX, 250 ml.

    Two Little Fishies

    Two Little Fishes Bactiv8 NPX, 250 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...

    $9.26
  • Seachem Focus 5 gr. Seachem Focus 5 gr.

    Seachem

    Seachem Focus 5 gr.

    Seachem Focus 5 gr. Focus is an antibacterial polymer for internal infections of fish. It may be used alone or mixed with other medications to make them palatable to fish and greatly reduce the loss of medication to the water through diffusion. For use...

    MSRP: $9.99
    $8.99
  • Seachem ENTICE Appetite Stimulant, 250 ml. Seachem ENTICE Appetite Stimulant, 250 ml.

    Seachem

    Seachem ENTICE Appetite Stimulant, 250 ml.

    Seachem ENTICE Appetite Stimulant, 250 ml. Entice is an all natural scent and flavor enhancer for finicky eaters. Simply soak any food item in Entice to attract the interest of finicky eaters. Ideal for all marine and freshwater fish.Directions: Briefly...

    $8.95
  • Two Little Fishes Magnesium Concentrate 500ml.

    Two Little Fishies

    Two Little Fishes Magnesium Concentrate 500ml.

    No Description AvailableTwo Little Fishies Magnesium Concentrate is a solution that contains the element magnesium, an essential pH-stabilizing component of the seawater buffering system. Magnesium is also important for the operation of various cellular...

    $8.81
  • DrTim's Aquatics MARINE Eco-Balance, 4oz. DrTim's Aquatics MARINE Eco-Balance, 4oz.

    Dr. Tim's Aquatics

    DrTim's Aquatics MARINE Eco-Balance, 4oz.

    DrTim's Aquatics MARINE Eco-Balance, 4oz. 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...

    $7.99
  • DrTim's Aquatics FRESHWATER First Defense, 8 oz DrTim's Aquatics FRESHWATER First Defense, 8 oz

    Dr. Tim's Aquatics

    DrTim's Aquatics FRESHWATER First Defense, 8 oz

    DrTim's Aquatics FRESHWATER First Defense, 8 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...

    $7.95
  • DrTim's Aquatics Ammonium Chloride, 4oz. DrTim's Aquatics Ammonium Chloride, 4oz.

    Dr. Tim's Aquatics

    DrTim's Aquatics Ammonium Chloride, 4oz.

    DrTim's Aquatics Ammonium Chloride, 4oz. Ammonia for fishless cyclingOne of our most popular products is our Ammonium Chloride for fishless cycling. As the term implies fishless cycling means without fish but there needs to be a source of ammonia for...

    $6.99
  • Two Little Fishes Iodine Concentrate 250ml.

    Two Little Fishies

    Two Little Fishes Iodine Concentrate 250ml.

    Two Little Fishes Iodine Concentrate 250ml. Two Little Fishies Iron Concentrate is a solution that contains the elements iron and manganese, which are essential to the health of all plants, including the symbiotic zooxanthellae in corals and sea...

    $6.75