Discover aquarium tools, test kits, food and accessories and see the tanks using them.
Build your setup
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
1,688 matching items · Most used first
OtherFocustronic
The Focustronic Mastertronic Leak Detector Assembly is a replacement leak detector sensor with attached cable for the Mastertronic automated water tester. It alerts the unit to water leaks or spills, protecting the testing equipment and surrounding area from water damage.
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OtherFocustronic
A genuine Focustronic replacement sensor circuit board (12P) for the Mastertronic automated water tester; it is the essential sensor PCB component that enables the unit's automated measurements.
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OtherFocustronic
The Focustronic PCB X HO Sensor is a replacement optical level sensor for the Mastertronic automated water tester. It restores accurate fluid level detection when the original sensor is damaged or fails.
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OtherFocustronic
The Focustronic Mastertronic PCB Y HO Sensor is a replacement sensor PCB for the Mastertronic automated water tester in the Y HO configuration. It keeps the automated testing unit functioning accurately.
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OtherFocustronic
The Focustronic Mastertronic Syringe + Needle Bundle contains 4 syringes and 6 needles used in the Mastertronic automated water tester. These are replacement consumables for regular maintenance, as needles should be changed about every four weeks to ensure testing accuracy.
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OtherBulk Reef Supply
Matthew’s Fish Food Bundle is a hand-picked mix of high-quality prepared foods for a rich, varied diet that supports healthy, colorful fish. It includes Reef Nutrition TDO Chroma Boost C2 pellets (3 oz, with astaxanthin for vibrant colors), Piscine Energetics 1mm mysis pellets (2 oz), BRS Reef Chili coral food (.65 oz) for corals and small fish, and Two Little Fishies Green Seaweed sheets (30 g) for herbivores like tangs and angelfish.
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OtherFlipper
The floating Flipper MAX is a 2-in-1 magnetic algae cleaner for large tanks with glass or acrylic up to 1 inch thick. Its patented design flips from scrubber to scraper simply by rotating the handle; made with strong rare-earth magnets, it cleans even stubborn coralline algae without ever sticking hands in the water, and includes two replaceable blades (stainless steel for glass tanks, ABS plastic for acrylic).
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OtherFlipper
Flipper MAX Float 2-in-1 magnetic algae cleaner for large tanks with glass or acrylic up to 1 inch thick; flips from scrubber to scraper and the wet side floats if detached. Includes stainless steel and ABS plastic replaceable blades; strong rare-earth magnets handle coralline algae.
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OtherRed Sea
The Red Sea MAX NANO is a 20-gallon all-in-one plug-and-play reef system with ultra-clear rimless glass, built-in rear sump filtration, a ReefLED 50 light, and a marine-spec cabinet.
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OtherBulk Reef Supply
An adhesive for aquarium construction or attaching aquascape materials. Brand: Bulk Reef Supply.
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OtherMaxspect
Maxspect Coral Tweezers are 14-inch carbon fiber aquarium tweezers with silicone-coated tips for safely handling delicate corals without damaging tissue. They are neutrally buoyant, so they hover in the water column if dropped, and are strong and lightweight enough to lift heavy objects in the aquarium.
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OtherJBJ
The JBJ Maxum Battery Backup Air Pump is a low-voltage AC/DC air pump with a built-in Li-Ion battery that provides up to 24 hours of high airflow during power outages. It features dual outputs for standard 3/16-inch airline tubing, continuous and interval modes, adjustable airflow with touch controls, and a quiet, water-resistant housing.
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OtherTropic Marin
The Tropic Marin Measuring Cylinder for Hydrometer (hydrometer sold separately) is a 500 mL (17 fl. oz.), 36 cm (14 in) tall cylinder made of transparent PP plastic, with a stable base, spout, and molded graduations — designed to hold the Tropic Marin high precision hydrometer for salinity measurement.
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OtherPolyplab
PolypLab Medic is a reef-safe antiparasitic water conditioner for marine and freshwater aquariums, containing an oxidizing agent effective against Marine Ich, Freshwater Ich, and Marine Velvet. Unlike many medications it will not harm invertebrates or nitrifying bacteria and targets the free-swimming stage of parasites. The 33g bottle treats approximately 500 gallons, dosed at one scoop per 50 gallons twice daily for a 10-day course.
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OtherBrightwell Aquatics
Brightwell Aquatics MediCoral Coral Dip is a triple-acting coral dip that protects new corals and frags from secondary infections and parasites by oxidizing damaged tissue, safe for all corals with no antibiotics or heavy metals, dosed 1 mL per gallon.
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OtherGiesemann
The Giesemann MegaChrome Blue 21000K Double Ended Bulb is a metal halide lamp for saltwater aquariums with a very high color temperature of more than 21000K, emulating the deeper portions of reefs with a rich blue tone and radiating actinic light. It highlights blue and green corals while still providing suitable growth, and is relied on by many public aquariums and research institutes for color stability, balance, and long lifespan. German-made. Available in 150w and 250W double-ended HQI versions.
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OtherGiesemann
The Giesemann MegaChrome Blue 21000K Single-Ended Bulb is a German-made metal halide lamp with >21000K color temperature that emulates deeper reef lighting with rich blue actinic light, highlighting blue and green coloration, available in 250w or 400w SE M80 mogul.
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OtherGiesemann
The Giesemann MegaChrome Coral 14500K single-ended metal halide bulb has a high blue blend that emulates the spectrum found on most reefs, giving corals fluorescent coloration while maintaining growth; it is available in 250W and 400W SE M80 (mogul) versions and is made in Germany.
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OtherGiesemann
A double-ended metal halide bulb from Giesemann at 17500K; it delivers optically white light with blue and violet peaks that make corals fluoresce, made in Germany for color stability and long life. Available in 150W and 250W DE HQI versions.
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OtherGiesemann
The Giesemann MegaChrome Marine 12500K Double Ended Bulb is a metal halide lamp for saltwater aquariums with a color temperature of 12,500K, giving off a crisp white coloration with just the smallest hint of blue for high performance and penetration. Its spectrum is higher in blue and lower in red, producing more light than similar lamps, and it emulates shallow reef depths for great coral growth. German-made, with high color stability, balance, and long lifespan. Available in 150w and 250W double-ended HQI versions.
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OtherAdaptive Reef
US Slip Male to Metric Male Adapter Ideal for connecting US slip fittings to metric plumbing, these adapters are perfect for modifying metric-based setups and converting them to standard US sizing for a custom build. Note: Because both ends of this adapter are male, you’ll need a coupler, union, or other slip fitting on each end.
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OtherAdaptive Reef
Adaptive Reef Metric to Standard PVC Coupler (Slip x Slip) converts European metric plumbing to standard US PVC with two female slip connections; it comes in five sizes from 20mm to 50mm (1/2 to 1-1/2 in) and provides a strong, permanent glued connection for skimmers, pumps, and reactors.
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OtherAdaptive Reef
A PVC union adapter that converts European metric plumbing (20mm-50mm) to US standard sizes (1/2 in. to 1-1/2 in.), with female slip sockets on both ends for gluing skimmers, pumps, and reactors into a system. Available in five sizes.
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OtherAquaReady
The AquaReady MFR-1 Magnetic Feeding Ring is a magnetically mounted feeding ring for freshwater or saltwater aquariums that keeps frozen, pellet, flake, or freeze-dried food contained in one spot so it reaches fish instead of the overflow, reducing waste and maintaining water quality. Food is dropped into the ring, soaks, and sinks where fish can easily eat it. Magnetic mount for easy placement. Outer diameter with bracket 3 inches, inner feeding opening 2.5 inches, height 6 inches.
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OtherTwo Little Fishies
Two Little Fishies Micro Airline Control Ball Valves offer an easy and precise way to adjust airflow in freshwater or saltwater aquarium setups. The high-quality ball valve design provides smooth, accurate adjustments for standard 3/16 inch airline tubing feeding air stones, sponge filters, nano protein skimmers, and more, without leaking like cheaper alternatives.
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OtherHikari
Hikari Tropical Micro Pellets (1.58 oz) are semi-floating, rapidly-softening pellets with marine and vegetable protein, ideal for small community tank fish with smaller mouths, supporting coloration, growth, and immune health.
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Other3F
Micro plankton frozen fish food (100 g) is a mixture of zoo- and phytoplankton, an ideal food for filter feeders, sponges, corals, and anemones.
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OtherHikari
Hikari Micro Wafers are a scientifically formulated daily diet for community fish that feed at the bottom, such as corydoras and loaches. The slowly sinking wafers provide complete, balanced nutrition in a highly digestible formula that promotes natural foraging behavior.
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OtherMilwaukee Instruments
The Milwaukee MC120 pH Monitor measures pH from 0.00 to 14.00 with 0.1 resolution, ±0.2 accuracy, manual 2-point calibration, a 5.5-9.5 pH set point, and visual LED alarm, with a double-junction pH electrode.
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OtherMilwaukee Instruments
Milwaukee pH Calibration Solution single-use packets (4.01, 7.01, 10.01 pH) for calibrating pH probes and pens every 30-60 days; compatible with all pH meters, 2-year shelf life.
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