Explore plant fertilizers, liquid CO2, reef dosing pumps and supplements used by aquarists.
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Find the gear behind the community's tanks.
Tanks, stands, lids
Canister filters, HOBs, protein skimmers, rollmats
Planted LEDs, high-actinic coral LEDs
Heaters, chillers, electronic controllers
Return pumps, wavemakers, gyres
Aquasoils, sands, dry reef rock, driftwood
Conditioners, RODI systems, marine salt mixes
Plant fertilizers, liquid CO₂, reef dosing pumps, calcium & alkalinity
Tools, food, testing, and the finishing touches
In community tanks
Chosen by aquarists
607 matching items · Most used first
SupplementationAquario
The AQUARIO Original CO2 Diffuser disperses CO2 in fine bubbles for optimal absorption, available in Small (12mm, up to 25 gallons), Medium (17mm, 25-50 gallons), and Large (24mm, 50+ gallons). Each includes the diffuser and two suction cup mounts for easy installation.
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SupplementationBulk Reef Supply
The BRS Pest Control Bundle is a value-priced set of aquarium pest and algae treatments. It combines multiple pest-control products for managing common reef aquarium pests in one convenient package.
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SupplementationSeachem
This glass pH drop checker monitors CO2 concentrations and pH levels in planted aquariums (especially those with CO2 injection), working with any aquarium size. Fill the bulb with 20 drops of the included pH-sensitive indicator solution and place it funnel-side down in the tank — the solution changes color from yellow (low pH / more CO2) to green to blue (high pH / less CO2). Includes the glass drop checker, suction cup mount, and indicator solution (refills available).
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SupplementationSeachem
The Seachem pH Checker Refill Solution is a CO2 indicator solution for use with the Seachem glass pH Checker in planted aquariums. The solution changes color from yellow to green to blue according to pH shifts caused by dissolved CO2, making CO2 concentration easy to monitor.
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SupplementationBrightwell Aquatics
A liquid pH increaser from Brightwell Aquatics made with high-purity materials; it rapidly raises pH and alkalinity in marine and reef aquaria, helping counter low pH from poor circulation or CO2 accumulation. Dose up to 5 ml per 20 gallons daily, keeping alkalinity within 7-12 dKH.
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SupplementationBulk Reef Supply
BRS Pharma Calcium Chloride 1-Gallon Mix (10 pack) — Ultra-pure calcium chloride for 2-part dosing in your reef tank. Also available: 1 gallon mix (1 single-use container), 5 gallon mix (5 single-use containers).
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SupplementationBulk Reef Supply
BRS Pharma Calcium Chloride 1-Gallon Mix (5 pack) — Ultra-pure calcium chloride for 2-part dosing in your reef tank. Also available: 1 gallon mix (1 single-use container), 10 gallon mix (10 single-use containers).
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SupplementationBulk Reef Supply
BRS Pharma Calcium Chloride 1-Gallon Mix (Single Use). Also available: 5 gallon mix (5 single-use pouches), 10 gallon mix (10 single-use pouches).
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SupplementationBulk Reef Supply
Bulk Reef Supply Pharma Kalkwasser is ultra-pure calcium hydroxide for maintaining calcium and alkalinity in reef aquariums. It mixes faster with fewer impurities and helps elevate pH; available in 2 lb and 4 lb sizes.
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SupplementationBulk Reef Supply
The BRS Pharma Kalkwasser Bulk Package is a 4-pound kalkwasser starter kit with everything needed to maintain calcium and alkalinity in a reef aquarium. It includes 4 pounds of ultra-pure pharma-grade kalkwasser, 7 pounds of pharma sodium bicarbonate, pharma calcium chloride mixes, and a pharma magnesium mix for balancing the tank before kalkwasser dosing.
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SupplementationBulk Reef Supply
The BRS Pharma Kalkwasser Starter Package is a 2-pound bundle of ultra-pure calcium hydroxide for maintaining calcium and alkalinity in reef aquariums. It is made from a high-purity source with very low aluminum content and is designed to be dosed through top-off water or a kalkwasser reactor.
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SupplementationBulk Reef Supply
BRS Pharma Magnesium Mix for 2-Part Maintenance is a pharmaceutical-grade pre-mixed blend of magnesium chloride and magnesium sulfate (5.25 cups : 2 cups) that makes 1 gallon of liquid magnesium solution. Designed for weekly or monthly dosing and small adjustments, it maintains magnesium levels to balance calcium and alkalinity in reef tanks without residue, keeping adjustments under 100 ppm per day.
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SupplementationBulk Reef Supply
The BRS Pharma Magnesium Mix for General Adjustments is a pre-measured, pharmaceutical-grade powder blend of magnesium chloride and magnesium sulfate (7 1/4 cups to 1/2 cup) that makes 1 gallon of liquid magnesium solution for reef aquariums. It is formulated with a low sulfate ratio for large one-time magnesium corrections, helping maintain the magnesium-calcium-alkalinity balance; mix the pouch into RO/DI water and dose up to 100 ppm per day.
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SupplementationBulk Reef Supply
BRS Pharma Soda Ash 1 Gallon Mix (Single Use). Also available: 5 gallon mix (5 single-use pouches), 10 gallon mix (10 single-use pouches).
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SupplementationBulk Reef Supply
BRS Pharma Soda Ash 1-Gallon Mix (10 pack) — Ultra-pure grade soda ash for 2-part dosing in your reef tank. Also available: 1 gallon mix (1 single-use container), 5 gallon mix (5 single-use containers).
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SupplementationBulk Reef Supply
BRS Pharma Soda Ash 1-Gallon Mix (5 pack) — Ultra-pure grade soda ash for 2-part dosing in your reef tank. Also available: 1 gallon mix (1 single-use container), 10 gallon mix (10 single-use containers).
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SupplementationBulk Reef Supply
BRS Pharma Sodium Bicarbonate 1-Gallon Mix — Ideal for large changes in alkalinity levels or daily dosing in aquariums with high pH. Each container is professionally weighed to make 1 gallon of sodium bicarbonate alkalinity solution.
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SupplementationTropic Marin
Tropic Marin Phos-Start is a particulate nutrient supply for new reef aquariums, for use during the first 2-3 months of the cycling phase; contains natural marine biopolymers as bacterial food to stimulate the microbiome, plus particulate phosphate, calcium, and trace elements (iodide, fluoride, bromide) as fine particles, targeting nutrients without unwanted water-column increases. Ideal for tanks using dry rock or bare bottom; promotes coralline algae growth and prepares the aquarium to support corals including sensitive SPS. Start with 1 mL per 100 US gallons daily (mix in 200 mL aquarium water, pour into high-flow area, ideally when lights are off); double after four weeks if phosphate 0.05-0.15 ppm is not reached; max 4 mL per 100 US gallons; after 2-3 months, transition to Phos-Feed.
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SupplementationHydrospace
The Hydrospace PNS HomeGro is a culture kit for economically growing your own purple non-sulfur bacteria (PNSB) at home. It includes a 2.5 gallon culture vessel with cap and spigot, sticker thermometer, growth medium powder, and an inoculum bottle with Rhodopseudomonas palustris, Rhodospirillum rubrum, and Rhodobacter sphaeroides; the finished culture treats approximately 8,000 gallons and provides superior nutrition while helping control nutrients and organic waste.
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SupplementationKorallen Zucht
Korallen-Zucht Pohl's A-Balance is a reef aquarium supplement that rapidly helps reduce cyanobacteria (especially when used with CyanoClean) and restore the system's biological balance. It also improves polyp extension and enhances yellow coral coloration, and is safe for all tank inhabitants; available in 100 mL, 250 mL, 500 mL, and 5 L sizes with an initial dose of 50 mL per 100 liters of tank water.
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SupplementationKorallen Zucht
Korallen-Zucht Pohl’s B-Balance is a mineral and additive supplement for reef aquariums that replaces elements partially removed by protein skimmers. It promotes robust coral growth and base encrustation, helps sustain difficult species like Cespitularia, and enhances intense red and pink coloration in SPS corals such as Stylophora and Pocillopora.
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SupplementationKorallen Zucht
Korallen-Zucht Pohls Coral Vitalizer; natural phosphate- and nitrate-free coral food for SPS, soft, and LPS corals. Increases polyp extension and promotes healthy growth and bright natural color; dose 1-3 drops per 25 gallons daily. Available in 10, 50, and 100 mL sizes.
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Korallen Zucht
Korallen Zucht Pohl's Coral Vitalizer (50 ml) is a natural coral food used as a food source for SPS, soft, and LPS corals; liquid and solid elements provide nutrition to a wide array of corals. One of the few phosphate and nitrate free coral foods; increased polyp extension after 7-10 days of daily dosing; corals obtain bright natural color and healthy growth; helps maintain difficult species like Goniopora and Alveopora; dose 1-3 drops per 25 gallons daily (dark period preferred); refrigerate after opening (12-month shelf life).
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SupplementationKorallen Zucht
Korallen-Zucht Pohls K-Balance Potassium Concentrate; highly concentrated potassium salts for maintaining natural potassium levels (380-410 mg/L). Enhances SPS growth and blue/purple coloration in Tridacna clams and SPS corals; dose 1 mL per 25 gallons daily.
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SupplementationKorallen Zucht
Korallen-Zucht Pohls K-Balance Potassium Strong; extra-strong concentrated potassium salts for raising potassium levels in large tanks. Maintains natural 380-410 mg/L levels, enhancing SPS growth and blue/purple coloration in Tridacna clams and SPS corals.
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SupplementationKorallen Zucht
Korallen-Zucht Pohls Xtra Concentrate; special blend of KZs most effective additives for improved coloration of mixed corals. Enhances color depth, growth rates, coral vitality, and daytime polyp extension; dose 1 mL per 25 gallons daily. Available in 10 mL to 1000 mL sizes.
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SupplementationKorallen Zucht
Korallen-Zucht Pohls Xtra Special; special blend of KZ additives with coloring agents and amino acids designed for ultra low nutrient systems and restoring deep natural coloration to pale corals. Dose 1 mL per 25 gallons daily; available in 100, 250, and 500 mL sizes.
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SupplementationKorallen Zucht
Korallen Zucht Pohl's Xtra Special 100 mL is a blend of KZ coloring agents and amino acids designed for ultra low nutrient systems and pale corals. Restores deep natural coloration and fluorescent tints while improving growth and vitality; dose 1 ml per 25 gal daily.
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SupplementationKorallen Zucht
Korallen Zucht Pohl's Xtra Special 250 mL is a blend of KZ coloring agents and amino acids designed for ultra low nutrient systems and pale corals. Restores deep natural coloration and fluorescent tints while improving growth and vitality; dose 1 ml per 25 gal daily.
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SupplementationKorallen Zucht
Korallen-Zucht Pohl’s K-Balance is a highly concentrated liquid potassium additive for reef aquariums (single-element, Zeovit dosing method). It maintains potassium at natural seawater levels of 380-410 mg/liter to support coral growth and coloration, enhancing blue/purple coloration in SPS corals and Tridacna clams. Dose 1 mL per 25 gallons per day; check potassium levels regularly and do not exceed the labeled dosage.
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