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In community tanks
Chosen by aquarists
5,380 matching items · Most used first
Substrates & AquascapingCeramicNature
The CeramicNature Red Triangle Breeding Cave (Large) is a handmade aquarium-safe ceramic shelter with an open front and closed back, designed for breeding L-number plecos up to 16 cm.
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Water PurificationFauna Marin
Fauna Marin RED X (250 ml) is a special formula that prevents algae growth in saltwater aquariums, treating unwanted algae in a biological/organic way that is gentle to aquarium inhabitants. Effective against green and red cyanobacteria, mild dinoflagellate infestation, gold and armor algae, and diatoms; when dosed correctly it is harmless to corals, fish, and invertebrates.
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FilterPro Clear Aquatic Systems
The Pro Clear RedFlex 100 Reef Sump is a 23.5 x 10 x 16 inch red and white acrylic sump rated for saltwater aquariums up to 100 gallons. It has a 4-inch 200-micron filter sock, bubble diffusers, an adjustable refugium water level gate, probe and dosing tube holders, and cord management; a filter sock, flexible hose, and foam block are included.
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FilterPro Clear Aquatic Systems
The Pro Clear Aquatic Systems RedFlex 200 is a reef sump purpose-built for saltwater aquariums up to 200 gallons, finished in red and white acrylic. Water passes through bubble diffusers into dual 4-inch 200-micron filter socks, with a refugium chamber whose flow gate adjusts water level between 6 and 9 inches, plus integrated dosing tube, probe, and cord management; includes filter socks, bulkheads, flexible hoses, and foam block.
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FilterPro Clear Aquatic Systems
The RedFlex 300 Reef Sump from Pro Clear Aquatic Systems is purpose-built for saltwater reef systems up to 300 gallons, with a bold red and white acrylic finish. Water enters through overflow ports, passes through integrated bubble diffusers, and flows into three 4-inch 200-micron filter socks for mechanical filtration; an overflow panel provides added protection allowing water to bypass safely if the socks clog. The refugium chamber features an adjustable flow gate that fine-tunes water levels between 6 and 9 inches to match skimmer requirements. Integrated dosing tube holders, probe mounts, and wire management keep equipment organized; includes flexible hoses, 4-inch filter socks, foam block sponge, and (2x) 1-inch bulkheads. 37x14.5x16 inches.
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FilterPro Clear Aquatic Systems
The Pro Clear RedFlex 400 Reef Sump is a 45-by-14.5-by-16-inch acrylic filtration sump for saltwater systems up to 400 gallons. It routes water through dual overflows, bubble diffusers, and 4-inch 200-micron filter socks, with dosing, probe, and wire holders built in.
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FilterPro Clear Aquatic Systems
The Pro Clear RedFlex 4in1 100 Sump offers flexible filtration for salt or freshwater systems up to 100 gallons; it features a 4-inch 200-micron filter sock, a skimmer chamber, a chemical media canal, a convertible refugium with a built-in frag rack, and integrated probe, dosing tube, and cord management.
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FilterPro Clear Aquatic Systems
The Pro Clear Aquatic Systems RedFlex 4in1 200 Sump (32 x 12 x 16 in, up to 200 gallons) features dual overflow ports, 200-micron filter socks, skimmer chamber, chemical media canal, configurable refugium with frag rack, and probe/dosing tube holders.
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FilterPro Clear Aquatic Systems
The Pro Clear RedFlex 4in1 300 is a 37-by-14.5-by-16-inch convertible acrylic sump that transitions between saltwater and freshwater setups. It features a modern red and white design with dual overflow inputs, mechanical filtration, and chambers for a skimmer, media, and return pump.
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FilterPro Clear Aquatic Systems
The Pro Clear RedFlex 4in1 400 Sump is a 45 x 14.56 x 16 inch configurable acrylic sump rated for systems up to 400 gallons. Water flows through dual overflows, bubble diffusers, three 4-inch 200-micron filter socks, a skimmer chamber, and a chemical media canal into a configurable refugium or return section with an integrated frag rack; filter socks, hoses, bulkheads, dosing tubes, probe holders, and a foam block are included.
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OtherRed Sea
Brightwell Aquatics NeoPhos is a balanced liquid phosphorus supplement for phosphorus-limited, ultra-low-nutrient reef aquaria; used alongside MicroBacter7 and Reef Biofuel or Katalyst, it enables natural microbial nitrogen uptake to lower ammonia, nitrite, and nitrate without chemical filtration media.
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OtherRed Sea
Red Sea's Alkalinity Pro test kit, an advanced titration test measuring KH/alkalinity in reef aquariums with 0.05 meq/L (0.14 dKH) accuracy. The kit includes a precision titrator and provides 75 tests for tracking buffer levels.
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OtherRed Sea
Red Sea Ammonia Test Kit is a colorimetric test that measures total ammonia (NH3/NH4) in saltwater from 0 to 2 ppm with 0.2 ppm resolution. It provides 100 tests for monitoring toxic ammonia during cycling and routine tank maintenance.
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OtherRed Sea
Reagent refill for the Red Sea Calcium Pro Test Kit, with enough reagent for 75 tests. Red Sea reagent refills make this line of test kits one of the most affordable high quality test kits available.
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OtherRed Sea
Red Sea Calcium Pro is an advanced titration test kit that measures calcium in reef aquariums with 5 ppm accuracy, supporting precise dosing of calcium supplements. The kit performs 75 tests and includes a single-hand precision titrator, analytical-grade glass vials, and a chemical-resistant storage case.
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OtherRed Sea
The Red Sea Iodine Pro (I2) test kit is a highly accurate colorimetric test for total iodine in marine aquariums, with a range of 0-0.09 ppm and 0.01 ppm accuracy across 50 tests; it enables precise dosing of Red Sea's Coral Colors A supplement as part of the Reef Care Program.
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SupplementationRed Sea
Red Sea KH Coralline Gro (500 mL) is a liquid supplement that boosts coralline algae growth in soft coral or fish-only saltwater aquariums, giving the tank an established look while helping discourage nuisance algae. It contains a complex of carbonate buffers, potassium, and trace elements; 1 mL raises the alkalinity of 25 gallons by 0.1 dKH.
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OtherRed Sea
Delux LED Controller.
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OtherRed Sea
The Red Sea Magnesium Pro Test Kit is a high-accuracy titration test for measuring magnesium in reef aquariums, accurate to 20 ppm. It includes a single-handed precision titrator, reagents, analytical-grade glass vials, and a color card in a chemical-resistant case, providing up to 100 tests to support accurate dosing of Red Sea's Reef Foundation C magnesium supplement.
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OtherRed Sea
The Red Sea Marine Care Test Kit bundles the essential saltwater tests for monitoring a new or established tank's biological cycle and ongoing maintenance: ammonia (100 tests), nitrate (100), nitrite (60), pH (100), and alkalinity (55 titration tests), all in analytical-grade glass vials.
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OtherRed Sea
Red Sea combined nitrate/nitrite marine test kit providing 50 advanced colorimetric nitrate tests (0-250 ppm range, 2 ppm accuracy) and 50 nitrite tests (0-1 ppm range, 0.05 ppm accuracy). Essential during the maturation of marine and reef aquariums and for ongoing nutrient/algae management; includes reagents, glass vial, syringe, and color cards.
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OtherRed Sea
A color-comparator test kit from Red Sea that accurately measures nitrate (NO3) in marine aquariums with a range of 0 to 64 ppm and an accuracy of ±0.125 ppm. It includes reagents for 100 tests, with affordable refill reagents available, helping reef aquarists monitor and control nutrient levels to prevent algae outbreaks and promote coral health.
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OtherRed Sea
Reagent refill for the Red Sea Nitrate Pro Test Kit, providing enough reagent for 100 nitrate tests so you can keep using the kit without buying a full replacement.
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OtherRed Sea
Red Sea pH/Alkalinity Test Kit is a dual 2-in-1 kit for marine aquariums combining an accurate titration test for KH and alkalinity (1 dKH accuracy) with a fast colorimetric test for pH. It provides 100 pH tests and 55 KH tests with glass vials, syringes, and color cards.
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OtherRed Sea
Red Sea Phosphate Pro is a colorimetric test kit with an easy-read comparator that measures phosphate (PO4) in reef aquariums with 0.02 ppm accuracy over a 0 to 5 ppm range. The kit performs 100 tests and supports affordable reagent refills.
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OtherRed Sea
The Red Sea Phosphate Pro Reagent Refill Kit replenishes the Red Sea Phosphate Pro Test Kit with enough reagent (Reagent A 50ml and Reagent B 15ml, plus a replacement color wheel) for 100 more high-accuracy colorimetric comparator phosphate tests at 0.02 ppm resolution.
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OtherRed Sea
Red Sea Reef Foundation Pro Multi Test Kit is a high-accuracy titration kit for measuring calcium, alkalinity (KH), and magnesium, the three foundation elements of reef chemistry. It includes a precision titrator and provides 75 tests per parameter for reliable dosing decisions.
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SupplementationRed Sea
Red Sea Trace Colors A (Iodine/Halogens) is a liquid supplement for reef aquariums containing an iodine, bromine, and fluorine complex that promotes pink coloration in corals; the halogens act as antioxidants in coral soft tissue and mucus, reducing bleaching risk. One mL raises the iodine level of 25 gallons (100 liters) by 0.03 ppm; 500 mL (16.9 fl oz).
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SupplementationRed Sea
The Red Sea Coral Colors ABCD 4-Pack supplies the 31 minor and trace elements corals consume in four 100 mL bottles: A (iodine/halogens) for pink colors, B (potassium) for red colors, C (iron/trace elements) for green/yellow colors, and D (trace element complex) for purple/blue colors. Dose 1 mL per 25 gallons daily for every 20 ppm of calcium the system consumes; complements the Reef Foundation and Reef Energy programs.
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SupplementationRed Sea
Red Sea Trace Colors B (Potassium), 500 mL, is a trace-element supplement providing potassium to promote the red colors in corals; 1 mL raises potassium in 25 gallons (100 liters) by 1.75 ppm. It is one of four Red Sea Trace Colors groups (A iodine/halogens for pink, B potassium for red, C iron/complementary elements for green, D trace element complex for purple/blue) targeting proper coloration of SPS corals in saltwater aquariums.
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