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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
5,380 matching items · Most used first
FilterPenn-Plax
The Cascade Pro Series III Canister Filter is a quiet, compact canister filter for fresh and saltwater aquariums up to 100 gallons, delivering 350 GPH with quick priming and adjustable flow control. It comes preloaded with floss, bio sponge, carbon pads, and ceramic rings in 4 interlocking media baskets, plus 360-degree rotating detachable valves.
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FilterMatrikx
A case of 20 MATRIKX CTO Plus 1-micron carbon blocks (10 x 2.5 inch) for RO/DI systems; NSF certified with high VOC and chemical adsorptive capacity, rated for 20,000 gallons at 1 GPM.
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FilterMatrikx
The MATRIKX CTO 5 Micron Carbon Block (10 x 2.5 in, case of 20) removes chlorine, taste, odor, and organic chemicals while providing sediment filtration, made from high-purity acid-washed activated carbon for standard 10-inch RO units.
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FilterBulk Reef Supply
Case of 25 BRS Universal Carbon Block Filters with 1 micron nominal filtration for RO/DI systems. High performance catalytic carbon blocks deliver industry-leading chloramine and chlorine reduction with 30% more carbon than standard blocks, and are NSF certified.
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FilterBulk Reef Supply
A case of 25 carbon block filter cartridges rated at 5 microns for chlorine and VOC (volatile organic compound) removal. They are used as pre-filters in aquarium RO/DI water purification systems.
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FilterGE Water Technologies
This is a case of 40 GE Purtrex depth sediment filters (2.5 inches x 10 inches, 1 micron) for RO/DI systems. The graded-density polypropylene cartridges trap particles throughout their thickness to protect downstream carbon and membrane stages.
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FilterGE Water Technologies
The Case (40) of 2.5" x 10" 5 Micron Purtrex Depth Sediment Filters is a bulk 40-pack of true-graded 5-micron depth filters for RO/DI systems. The depth-graded design traps sediment throughout the cartridge, providing consistent filtration and long service life for high-volume water purification setups.
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FilterGE Water Technologies
The GE ROSave.Z Depth Filter case (40) is a case of 40 NSF 42-certified, 10-inch 1-micron polypropylene depth filters using Z.Plex technology for reverse osmosis pretreatment with up to twice the life of conventional depth filters.
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FilterGE Water Technologies
The GE ROSAVE.Z Case (40) is a bulk box of forty 10 x 2.5-inch, 5-micron depth sediment filters for reverse-osmosis pretreatment. Using GE's Z.Plex polypropylene matrix, they offer up to twice the life and greater dirt-holding capacity of conventional depth filters.
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FilterBulk Reef Supply
Bulk case of 50 BRS 4 x 14 inch felt filter socks with plastic rings, 200 micron felt that mounts to common sump holders and overflow drains. Felt removes finer floating particles than mesh socks, improving water quality and reducing filter maintenance, though it clogs faster.
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FilterBulk Reef Supply
A case of 50 felt filter socks, 7 inches in diameter by 16 inches long, with a plastic ring for mounting in a sump. They mechanically filter particulates out of aquarium water and are rated to trap fine debris before it breaks down.
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Substrates & AquascapingLiquid Gardens
Liquid Gardens Catappa Leaves (10 ct) release tannins that tint water a light brown, mimicking natural blackwater environments, with believed anti-bacterial and anti-fungal properties that benefit breeding fish and shrimp; decomposing leaves provide biofilm food and shelter.
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OtherHamilton Technology
The Hamilton Cayman Sun is a double-ended (HQI) metal halide reflector with a German mirror finish and rust-proof aluminum housing, a tempered glass UV lens, 12-foot cord with quick disconnect, and steel suspension cables; bulb and ballast sold separately.
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SupplementationTwo Little Fishies
Aquaforest AF Rocks Mud is an 18 lb box of pest-free natural live rock for marine aquariums.
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Climate ControlJBJ
The JBJ C-Breeze Nano is a quiet centrifugal aquarium cooling fan for tanks up to 40 gallons, lowering water temperature 1-4°F through evaporative cooling when mounted on the tank rim.
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OtherNeptune Systems
The Neptune Systems CD Crossover Diet is a dual-purpose pellet food developed with Reed Mariculture for the Neptune Systems AFS (Automatic Feeding System), sized ~1.7 mm in an easy-pour 3 oz pouch. Each pellet carries a micro-film of coral food that disperses into the water on contact for corals, then the pellet sinks for fish, offering color enhancement with 46% minimum crude protein and 16% minimum crude fat; formulated for omnivores including pellet-consuming LPS corals.
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Water PurificationModern Reef
Modern Reef C-Dip 1 & 2 is the world's first 2-stage immersion bath coral dip, free of iodine or oxidant; contains penetrating substances that affect egg strands of pests. C-Dip 1 (5-minute bath) is extremely effective against parasites and bacterial infections; C-Dip 2 (30-minute bath) adds a second protective layer and assists coral recovery from stress and damage. Use 12 drops per liter each; immersion bath only; may cause serious eye and skin irritation.
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FilterTwo Little Fishies
Two Little Fishies CDX Carbon Dioxide Adsorption Media strips CO2 from protein skimmer intake air to raise chronically low aquarium pH, turning from white to pink when exhausted.
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FilterMarinePure
MarinePure Ceramic Biomedia Plates (8 x 8 x 1 in) are inert, open-porosity ceramic media with ~5,750 sq ft of surface area for beneficial bacteria that remove ammonia and nitrites, usable in sumps, filters, or directly in saltwater or freshwater tanks.
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FilterSea Side Aquatics
Seaside Aquatics Ceramic Bio-Spheres are porous ceramic spheres (approx. 31mm diameter each) made from thousands of tiny ceramic balls fused together, offering roughly 600 sq ft of surface area per sphere for beneficial bacteria colonization. Sold in 1 lb packages (about 20 spheres) with a mesh bag, they provide compact biological filtration for sumps in freshwater or saltwater aquariums.
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Substrates & AquascapingCeramicNature
The CeramicNature Catfish Cave is a handmade aquarium-safe ceramic cave designed for plecos, catfish, loaches, shrimp, and crayfish. Its natural tree-trunk appearance suits Amazonian or rainforest aquascapes, while the open-front, closed-back design provides secure hiding spots and encourages successful breeding, with baked-in color that never fades.
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Substrates & AquascapingCeramicNature
The CeramicNature Ceramic Cavity Stone is a handmade aquarium-safe ceramic cave for freshwater aquariums, designed for breeding L-numbers, smaller catfish, and crayfish; it provides secure shelter with a natural stone appearance and comes in X-Small, Small, and Medium sizes.
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Substrates & AquascapingCeramicNature
The CeramicNature Ceramic Half Log (Mixed Color) is a handcrafted aquarium-safe ceramic hideout for freshwater aquariums, ideal for botias, catfish, corydoras, and lobsters; the durable, easy-to-clean ceramic color is baked into the clay and it comes in X-Small, Small, and Medium sizes.
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Substrates & AquascapingCeramicNature
The CeramicNature Ceramic Half Log (Natural Color) is a handmade hollow ceramic hideout for freshwater aquariums in natural color. Made in the Netherlands from 100% aquarium-safe ceramic, it provides secure shelter for catfish, loaches, and shrimp without affecting water chemistry.
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Substrates & AquascapingCeramicNature
The CeramicNature Ceramic Igloo Cave is a handcrafted ceramic hideout for aquariums. The 100 percent aquarium-safe ceramic does not affect water chemistry and provides fish, shrimp, and plecos a place to hide and breed.
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Substrates & AquascapingCeramicNature
The CeramicNature Ceramic Log is a handcrafted aquarium-safe ceramic tree-trunk hideout for freshwater aquariums, available in five sizes from X-Small to X-Large with a natural look that pairs well with attached mosses and plants.
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Substrates & AquascapingCeramicNature
The CeramicNature Ceramic Pyramid is a handcrafted, aquarium-safe ceramic shelter for shrimp, small catfish, kuhli loaches, corydoras, otocinclus, and other small fish. Handcrafted in the Netherlands with a natural tree-trunk texture, it is smooth and open at the back for easy access; its porous ceramic surface encourages beneficial bacteria growth. Available in 3-tube, 6-tube, and 10-tube sizes.
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Substrates & AquascapingCeramicNature
The Ceramic Round Cave (Brown) from Ceramic Nature is a handcrafted premium clay cave inspired by natural formations, sized 9.5 x 4 x 3 cm. It serves as a natural hideaway and breeding space for catfish and other small aquarium inhabitants, with durable, long-lasting color and easy cleaning.
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Substrates & AquascapingCeramicNature
The Ceramic Round Cave (Mixed Color) from CeramicNature is a rounded ceramic shelter for freshwater aquariums. It gives fish, shrimp, and other tank inhabitants a safe hiding and breeding spot in a natural mixed-color finish.
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Substrates & AquascapingCeramicNature
A handmade aquarium-safe ceramic cave from CeramicNature in terracotta red; the closed-back, open-front design gives plecos and other cave spawners a secure spot to hide and deposit eggs, with sizing for L-numbers up to 18 cm. The durable, easy-to-clean color is baked into the clay so it never fades.
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