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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.

  • 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
  • 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
  • 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
  • Two Little Fishes Marine Snow, 16oz.

    Two Little Fishies

    Two Little Fishes Marine Snow, 16oz.

    MarineSnow Plankton Diet is a first of its kind product that reproduces the special biogenic suspended matter found in natural seawater, including marine snow aggregates...MarineSnow Plankton Diet is a first of its kind product that reproduces the...

    $18.90
  • 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: $22.00
    Now: $18.70
  • Seachem Prime, 500 ml. Seachem Prime, 500 ml.

    Seachem

    Seachem Prime, 500 ml.

    Seachem Prime, 500 ml. Prime™ is the complete and concentrated conditioner for both fresh and salt water. Prime™ removes chlorine, chloramine and ammonia. Prime™ converts ammonia into a safe, non-toxic form that is readily removed...

    $18.69
  • Two Little Fishes BioPronto Marine, 8 oz.

    Two Little Fishies

    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
  • 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...

    $18.49
  • Reef Endurance Bulk Magnesium Chloride, 3lbs Reef Endurance Bulk Magnesium Chloride, 3lbs Reef Endurance Bulk Magnesium Chloride, 3lbs

    Reef Endurance

    Reef Endurance Bulk Magnesium Chloride, 3lbs

    Reef Endurance Bulk Magnesium Chloride, 3lbs Pharmaceutical-Grade Magnesium Sulfate Aquarium Supplement Reef Endurance Magnesium Chloride is a pharmaceutical-based aquarium supplement that mixes crystal clear with no unwanted impurities. Maintaining a...

    $17.99
  • Reef Endurance Bulk Magnesium Sulfate, 4lbs Reef Endurance Bulk Magnesium Sulfate, 4lbs Reef Endurance Bulk Magnesium Sulfate, 4lbs

    Reef Endurance

    Reef Endurance Bulk Magnesium Sulfate, 4lbs

    Reef Endurance Bulk Magnesium Sulfate, 4lbs Pharmaceutical-Grade Magnesium Sulfate Aquarium Supplement Reef Endurance Magnesium Chloride is a pharmaceutical-based aquarium supplement that mixes crystal clear with no unwanted impurities. Maintaining a...

    $17.99
  • Reef Endurance Bulk Soda Ash, 3.5lbs Reef Endurance Bulk Soda Ash, 3.5lbs Reef Endurance Bulk Soda Ash, 3.5lbs

    Reef Endurance

    Reef Endurance Bulk Soda Ash, 3.5lbs

    Reef Endurance Bulk Soda Ash, 3.5lbs Pharmaceutical-Grade Soda Ash Aquarium Supplement Reef Endurance Soda Ash is a Pharmaceutical-based reef aquarium supplement that mixes crystal clear with no unwanted impurities. Maintaining alkalinity within a range...

    $17.99
  • Reef Endurance Bulk Sodium Bicarbonate, 4.5lbs Reef Endurance Bulk Sodium Bicarbonate, 4.5lbs Reef Endurance Bulk Sodium Bicarbonate, 4.5lbs

    Reef Endurance

    Reef Endurance Bulk Sodium Bicarbonate, 4.5lbs

    Reef Endurance Bulk Sodium Bicarbonate, 4.5lbs Pharmaceutical-Grade Sodium Bicarbonate Aquarium Supplement for Higher pH Systems Reef Endurance Sodium Bicarbonate is a pharmaceutical-based reef supplement that mixes crystal clear with no unwanted...

    $17.99
  • Sea Lab #28 Replenisher 1/2 lb. Jar Sea Lab #28 Replenisher 1/2 lb. Jar

    Sea Lab #28 Replenisher 1/2 lb. Jar

    Sea Lab #28 Replenisher 1/2 lb. Jar Approximately 50 nuggets.   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...

    $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
  • Caribsea Purple Up 16 oz Caribsea Purple Up 16 oz

    CaribSea

    Caribsea Purple Up 16 oz

    PURPLE-UP Coraline Algae Accelerator by CaribSea, 16 oz. NOT A FERTILIZER: Purple Up™ encourages the growth of desirable pink and purple coralline algaes not nuisance algaes not nuisance algaes.UNIQUE DUAL METHOD APPROACH TO CORALLINE ALGAE...

    $17.95
  •  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...

    $17.47
  • ASF Reef Shots Probiotics - 24 Shots ASF Reef Shots Probiotics - 24 Shots

    Aquarium Systems

    ASF Reef Shots Probiotics - 24 Shots

    ASF Reef Shots Probiotics - 24 Shots The normal processes in an aquarium cause the system to become unbalanced, allowing unfriendly bacteria and algae to dominate and negatively impact water quality. Probiotics Reef Shot will maintain a balanced,...

    Was: $20.50
    Now: $17.43
  • Tropic Marin Dry Balling Salt Part A - Calcium, 1 kg. Tropic Marin Dry Balling Salt Part A - Calcium, 1 kg.

    Tropic Marin

    Tropic Marin Dry Balling Salt Part A - Calcium, 1 kg.

    Tropic Marin Dry Balling Salt Part A, 1 kg. Part A - 1 kg Calcium Chloride Dihydrate One of the three-part original balling method, Tropic Marin components add calcium, alkalinity, and sodium chloride free sea salt to maintain the crucial balance...

    $17.40
  • Seachem Clarity 500 ml. Seachem Clarity 500 ml.

    Seachem

    Seachem Clarity 500 ml.

    Seachem Clarity 500 ml. Water clarifier for marine and freshwater Clears all types of clouding Reef and plant safe Clarity™ is the ultimate clarifier for both fresh and saltwater. It employs an advanced polymeric flocculating agent that is both...

    $17.04
  • Seachem Stability 500 ml. Seachem Stability 500 ml.

    Seachem

    Seachem Stability 500 ml.

    Seachem Stability 500 ml. New tank stabilization system for marine and freshwater Rapidly and safely establishes bio-filter Prevents "New Tank Syndrome" Stability® will rapidly and safely establish the aquarium biofilter in freshwater and marine...

    $17.04
  • API Melafix Marine Medication, 16 oz.

    API

    API Melafix Marine Medication, 16 oz.

    API Melafix Marine Medication, 16 oz. Marine Melafix by API is an anit-bacterial fish and coral remedy. Melafix is an all natural fish and coral treament with Tea Tree extract. This products rapidly repairs damaged fins, ulcers, and open wounds. It...

    $16.99
  • API Melafix Medication , 16 oz.

    API

    API Melafix Medication , 16 oz.

    API Melafix Medication , 16 oz. Melafix is a breakthrough antibacterial remedy that uses a derivitive of the Melaleuca (Tea Tree) to treat bacterial infections in fresh and saltwater fish. Rapidly repairs damaged fins, heals open wounds and ulcers,...

    $16.99
  • Hikari Stress-X Water Conditioner 16oz.

    Hikari

    Hikari Stress-X Water Conditioner 16oz.

    Hikari Stress-X Water Conditioner 16oz. A Tried & True Formulation Breaks the chloramine bond and removes chlorine and free ammonia Detoxifies nitrite and heavy metals (including copper) Boosts alkalinity Replaces only lost or damaged skin-slime...

    $16.99
  • PolypLab Reef Primer Shot Coral Dip 45 gr. PolypLab Reef Primer Shot Coral Dip 45 gr.

    PolypLab

    PolypLab Reef Primer Shot Coral Dip 45 gr.

    PolypLab Reef Primer Shot Coral Dip 45 gr. TO BE USED AS A DIP ONLY. Not to be used in the aquarium. Reef Primer is a premium dip for your corals and frags. Use in your acclimation routine before adding new corals to your system. Reef Primer will...

    $16.99
  • 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
  • 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 Fishies

    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
  •  Tropic Marin BIO-STRONTIUM, 200gr.   Tropic Marin BIO-STRONTIUM, 200gr.

    Tropic Marin

    Tropic Marin BIO-STRONTIUM, 200gr.

    Tropic Marin BIO-STRONTIUM, 200gr. Tropic Marin Bio-Strontium is biologically Ideal Strontium Supplement for Reef Aquariums. A sufficient supply of strontium and carbon dioxide is as essential for the growth and well-being of reef-building corals...

    $16.14
  • 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...

    Was: $18.95
    Now: $16.11
  • 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...

    Was: $18.95
    Now: $16.10
  • 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...

    Was: $18.95
    Now: $16.10
  • 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...

    Was: $18.95
    Now: $16.10
  • 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...

    Was: $18.95
    Now: $16.10
  • 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
  • DrTim's Aquatics FRESHWATER First Defense, 16 oz DrTim's Aquatics FRESHWATER First Defense, 16 oz

    Dr. Tim's Aquatics

    DrTim's Aquatics FRESHWATER First Defense, 16 oz

    DrTim's Aquatics FRESHWATER First Defense, 16 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...

    $15.95