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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.

  • Reef Solution, 16oz. by Ecosystem Aquarium Reef Solution, 16oz. by Ecosystem Aquarium

    EcoSystem Aquarium

    Reef Solution, 16oz. by Ecosystem Aquarium

    Reef Solution™ is the ideal all natural, multipurpose additive created for enhancing the marine aquarium environment. Outstanding results for both reef and fish only aquariums. In reef systems, polyp extensions on corals is phenomenal. In fish only...

    $24.95
  • ESV Bionic Calcium Buffer System, 2 x 32 oz. ESV Bionic Calcium Buffer System, 2 x 32 oz.

    E.S.V.

    ESV Bionic Calcium Buffer System, 2 x 32 oz.

    ESV Bionic Calcium Buffer System, 2 x 32 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...

    Was: $28.95
    Now: $24.61
  • Tropic Marin All-For-Reef, 500 ml. Tropic Marin All-For-Reef, 500 ml.

    Tropic Marin

    Tropic Marin All-For-Reef, 500 ml.

     Tropic Marin All-For-Reef, 500 ml. Tropic Marin All-For-Reef contains all the essential minerals and trace elements required by corals to grow in an easy to use balanced solution. Including calcium, magnesium, strontium, and carbonate hardness...

    $24.01
  • CoralRX PRO Coral Dip, 1 oz. Makes 17 gal. CoralRX PRO Coral Dip, 1 oz. Makes 17 gal.

    CoralRX

    CoralRX PRO Coral Dip, 1 oz. Makes 17 gal.

    CoralRX PRO Coral Dip, 1 oz. Makes 17 gal.Coral Rx was developed in 2006 for two purposes: to treat corals suffering with parasites, and as a prophylactic measure to promote healthy corals before parasites or bacterial infections become harmful. Coral Rx...

    $23.99
  • BlueLife Green Cyano Rx

    BlueLife

    BlueLife Green Cyano Rx

    BlueLife Green Cyano Rx Green Cyano Rx will quickly and effectively treat disease causing cyano bacteria from rock, plants, gravel and sand in your freshwater aquarium without harming any of its inhabitants including beneficial bacteria when used as...

    $23.85
  •  Seachem Reef Builder, 1,200 gr.   Seachem Reef Builder, 1,200 gr.

    Seachem

    Seachem Reef Builder, 1,200 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, 1,200 gr.Reef Builder ™ raises carbonate alkalinity without immediately...

    $23.62
  • Seachem Reef Buffer, 1,000 gr. Seachem Reef Buffer, 1,000 gr.

    Seachem

    Seachem Reef Buffer, 1,000 gr.

    Reef Buffer is intended primarily for use in a reef system where the maintenance of a pH of 8.3 is often difficult...Seachem Reef Buffer, 1,000 gr.Reef Buffer™ is intended primarily for use in a reef system where the maintenance of a pH of 8.3...

    $23.62
  • Two Little Fishes SeaElements 250ml.

    Two Little Fishies

    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...

    $22.99
  • ATI Elements Reference Supplement 1000 ml

    ATI

    ATI Elements Reference Supplement 1000 ml.

    ATI Elements Reference Supplement 1000 ml. The ATI Elements Reference contains the natural balance of elements and salinity in its solution to refer to when using at home test kits.  ATI Elements Reference will  also help calibrate hydrometers...

    $22.95
  • Brightwell Aquatics KoraLagoon Substrate, 1.4 kg. / 3.1 lb.

    Brightwell Aquatics

    Brightwell Aquatics KoraLagoon Substrate, 1.4 kg. / 3.1 lb.

    Brightwell Aquatics KoraLagoonSubstrat Aragonite RefugiumSubstrateA blend of high-purity aragonite particulate grades to simulate the natural substrate particle profile of tropical reef lagoonsBrightwell Aquatics KoraLagoon Substrate, 1.4 kg. / 3.1 lb. A...

    Was: $26.95
    Now: $22.91
  • Two Little Fishes AcroPower, 500 ml.

    Two Little Fishies

    Two Little Fishes AcroPower, 500 ml.

    Two Little Fishes AcroPower, 500 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...

    $22.70
  • C-Balance by Two Little Fishes, 2 x 500 ml.

    Two Little Fishies

    C-Balance by Two Little Fishes, 2 x 500 ml.

    No Description AvailableC-Balance by Two Little Fishes, 2 x 500 ml.This two-part calcium and alkalinity maintenance system adjusts calcium, magnesium, and strontium ions to Natural Seawater ratios, and achieves a balanced ionic residual. Makes...

    $22.29
  • 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,...

    $22.00
  • Red Sea DipX Coral Dip 500ml. Red Sea DipX Coral Dip 500ml. Red Sea DipX Coral Dip 500ml. Red Sea DipX Coral Dip 500ml.

    Red Sea

    Red Sea DipX Coral Dip 500ml.

    Red Sea DipX Coral Dip 500ml. 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...

    $21.99
  • Red Sea Reef Energy AB+ Plus Coral Nutrition, 250 ml Red Sea Reef Energy AB+ Plus Coral Nutrition, 250 ml

    Red Sea

    Red Sea Reef Energy AB+ Plus Coral Nutrition, 250 ml

    Red Sea Reef Energy AB+ Plus Coral Nutrition, 250 ml An all-in-one superfood that will have your corals thanking you, delivering better growth, higher resilience, brighter colors, greater ease of use with automatic dosers, and minimal over skimming...

    $21.99
  • Red Sea Reef Foundations A (Ca/SR) 500 ML Red Sea Reef Foundations A (Ca/SR) 500 ML

    Red Sea

    Red Sea Reef Foundations A (Ca/SR) 500 ML

    Reef Foundation® A Calcium and strontium complex for balanced formation of the coral skeletonCa | Sr Calcium, magnesium, strontium and carbonate are the basic foundation elements of coral skeletons.All of these elements need to be available in...

    $21.99
  • ASF Reef Shots Reef Elements - 24 Shots ASF Reef Shots Reef Elements - 24 Shots

    Aquarium Systems

    ASF Reef Shots Reef Elements - 24 Shots

    ASF Reef Shots Reef Elements - 24 Shots Reef Elements Reef Shot is a biological stimulant designed to promote growth and health of your reef aquarium. It contains essential trace elements in special compounds easily absorbed by marine organisms and fish...

    Was: $25.50
    Now: $21.68
  • 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...

    $21.67
  •  Fritz Mardel Maracyn Oxy 16 oz.   Fritz Mardel Maracyn Oxy 16 oz.

    Fritz

    Fritz Mardel Maracyn Oxy 16 oz.

    Fritz Mardel Maracyn Oxy 16 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...

    $21.24
  • ESV Liquid Carbonate Buffer 1 gal. ESV Liquid Carbonate Buffer 1 gal.

    E.S.V.

    ESV Liquid Carbonate Buffer 1 gal.

    ESV Liquid Carbonate Buffer 1 gal. 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: $24.95
    Now: $21.21
  •  Red Sea Reef Colors D (Trace) 500 ML

    Red Sea

    Red Sea Reef Colors D (Trace) 500 ML

    Red Sea Reef Colors D (Trace) 500 MLReef Color D: A complex of 18 trace elements. These 18 elements (out of all the trace elements in NSW) participate in the metabolic processes inside a coral’s skeleton and soft tissue. D elements are related to...

    $20.99
  • DrTim's Aquatics MARINE Clear-Up 16oz. DrTim's Aquatics MARINE Clear-Up 16oz.

    Dr. Tim's Aquatics

    DrTim's Aquatics MARINE Clear-Up 16oz.

    DrTim's Aquatics MARINE Clear-Up 16oz. 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...

    $20.99
  • Red Sea Reef Colors A (Iodina/Halogens) 500 ML

    Red Sea

    Red Sea Reef Colors A (Iodina/Halogens) 500 ML

    Red Sea Reef Colors A (Iodina/Halogens) 500 MLRed Sea Reef Colors A (Iodina/Halogens) 500 MLReef Color A: A complex of halogens (Iodine, Bromine and Fluorine). The halogens act both as antioxidants and oxidative agents within the soft tissue and mucus...

    $20.99
  • Red Sea Reef Colors B (Potassium) 500 ML

    Red Sea

    Red Sea Reef Colors B (Potassium) 500 ML

    Red Sea Reef Colors B (Potassium) 500 MLRed Sea Reef Colors B (Potassium) 500 MLReef Color B: A complex of Potassium and Boron. Potassium plays an essential role in the transportation of coral nutrients within the soft tissue (including the nutrients...

    $20.99
  • Red Sea Reef Colors C (Iron/Trace) 500 ML

    Red Sea

    Red Sea Reef Colors C (Iron/Trace) 500 ML

    Red Sea Reef Colors C (Iron/Trace) 500 MLReef Color C: A complex of 8 “light” metals that includes Iron, Manganese, Cobalt, Copper, Aluminum, Zinc, Chrome and Nickel. These micro-elements are essential to many bio-chemical metabolic...

    $20.99
  • Red Sea Reef Foundations B (Alk) 500 ML

    Red Sea

    Red Sea Reef Foundations B (Alk) 500 ML

    Reef Foundation® BCarbonate & buffer complex for balanced formation of Coral SkeletonAlk Calcium, magnesium, strontium and carbonate are the basic foundation elements of coral skeletons.All of these elements need to be available in balanced...

    $20.99
  • Red Sea Reef Foundations C (MG) 500 ML

    Red Sea

    Red Sea Reef Foundations C (MG) 500 ML

    Red Sea Reef Foundations C (MG) 500 MLA successful coral reef aquarium depends on how well you maintain the water parameters which are the key to a stable coral environment. All of the elements found in natural seawater play a role in providing optimal...

    $20.99
  • 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...

    $20.97
  • 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...

    $20.86
  • ASF Reef Shots Strontium - 24 Shots ASF Reef Shots Strontium - 24 Shots

    Aquarium Systems

    ASF Reef Shots Strontium - 24 Shots

    ASF Reef Shots Strontium - 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...

    $20.50
  • Tropic Marin Elimi NP 250 ml. Tropic Marin Elimi NP 250 ml.

    Tropic Marin

    Tropic Marin Elimi NP 250 ml.

    Tropic Marin Elimi NP 250 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...

    $20.47
  • Brightwell Aquatics Vitamarin-M 250 ml. / 8.5 oz

    Brightwell Aquatics

    Brightwell Aquatics Vitamarin-M 250 ml. / 8.5 oz

    Brightwell Aquatics Vitamarin-M 250 ml. / 8.5 oz * Full-spectrum vitamin supplement formulated to benefit marine fishes, corals and other invertebrates, and other marine aquarium inhabitants.* Provides a full-complement of vitamins in the same ratios...

    Was: $23.95
    Now: $20.36
  •  Ruby Reef HydroPlex 16 oz.  Ruby Reef HydroPlex 16 oz.

    Ruby Reef

    Ruby Reef HydroPlex 16 oz.

    Ruby Reef HydroPlex 16 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...

    $19.99
  • 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...

    $19.99
  • AquaFinn MinnFinn Freshwater Medication

    MinnFinn

    AquaFinn MinnFinn Freshwater Medication

    AquaFinn MinnFinn Freshwater Medication MinnFinn® is based on disinfection technology used in the healthcare, medical and biotechnology industry. Unlike other treatments which can cause microbial resistance, MinnFinn® breaks apart the...

    $19.99
  • AquaFinn MinnFinn Saltwater/Reef Medication

    MinnFinn

    AquaFinn MinnFinn Saltwater/Reef Medication

    AquaFinn MinnFinn Saltwater/Reef Medication MinnFinn® is based on disinfection technology used in the healthcare, medical and biotechnology industry. Unlike other treatments which can cause microbial resistance, MinnFinn® breaks apart...

    $19.99
  • Copper Power, Freshwater 16 oz. Copper Power, Freshwater 16 oz.

    Copper Power

    Copper Power, Freshwater 16 oz.

    Copper Power, Freshwater 16 oz. Copper Power Freshwater is one of the safest and most effective copper medications available for the elimination of external parasites.  Copper Power, Freshwater 16 oz. Product code: 8717Item No. MD-COPF-16OZ

    $19.99
  • Copper Power, Marine 16 oz. Copper Power, Marine 16 oz.

    Copper Power

    Copper Power, Marine 16 oz.

     Copper Power, Marine 16 OZ.   Copper Power Marine is one of the safest and most effective copper medications available for the elimination of external parasites. Used at 2.5 PPM Copper - nearly 5-Times the normal toxic level of copper in...

    $19.99
  • CoralRX Coral Dip, 8 oz. Makes 12 gal.

    CoralRX

    CoralRX Coral Dip, 8 oz. Makes 12 gal.

    CoralRX Coral Dip, 8 oz. Makes 12 gal..Coral Rx was developed in 2006 for two purposes: to treat corals suffering with parasites, and as a prophylactic measure to promote healthy corals before parasites or bacterial infections become harmful. Coral Rx is...

    $19.99
  • DrTim's Aquatics FRESHWATER One & Only 4oz DrTim's Aquatics FRESHWATER One & Only 4oz

    Dr. Tim's Aquatics

    DrTim's Aquatics FRESHWATER One & Only 4oz

    DrTim's Aquatics FRESHWATER One & Only 4oz 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 We store this in a climate...

    $19.99
  • DrTim's Aquatics MARINE Eco-Balance, 16oz. DrTim's Aquatics MARINE Eco-Balance, 16oz.

    Dr. Tim's Aquatics

    DrTim's Aquatics MARINE Eco-Balance, 16oz.

    DrTim's Aquatics MARINE Eco-Balance, 16oz. 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...

    $19.99
  • DrTim's Aquatics MARINE First Defense 16oz. DrTim's Aquatics MARINE First Defense 16oz.

    Dr. Tim's Aquatics

    DrTim's Aquatics MARINE First Defense 16oz.

    DrTim's Aquatics MARINE First Defense 16oz. 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...

    $19.99
  • Erythromycin – Treats 200 Gallons

    AquaLife

    Erythromycin – Treats 200 Gallons

    Erythromycin – Treats 200 Gallons Effective against: -Fin and Tail Rot -Mouth and Eye Sores -Cloudy or Protruding Eyes -Wasting Away or Swollen Belly -Bacterial Infections -Popeye -Molly and Tetra Disease -Cyanobacteria (red slime) -For Ornamental...

    $19.99
  • Kanamycin Sulfate - Treats 200 Gallons

    AquaLife

    Kanamycin Sulfate - Treats 200 Gallons

    Kanamycin Sulfate - Treats 200 Gallons AquaLife Kanamycin Sulfate Full Spectrum- Treats 200 GallonsEffective against:-Fin and Tail Rot-Mouth and Eye Sores-Cloudy or Protruding Eyes-Wasting Away or Swollen Belly-Bacterial Infections-Popeye-Molly and Tetra...

    $19.99