Stephen Lee

We tested plug-in aquarium heater controllers for freshwater and reef tanks, comparing failsafe alarms, probe designs, load capacity, and ease of setup.

We tested eight aquarium filters for clear water, comparing media capacity, flow, noise, and upkeep to find the best fit for small, large, and green-water tanks.

Our picks for a tank you can sleep next to: a slim hang-on for small tanks, a canister that hides below, and motor-free sponges that never hum.

We tested quiet aerators for nano tanks, community tanks, and fish rooms. These picks keep the bubbles, not the motor, in the background.

Rechargeable and battery-backup aerators that keep fish alive through outages, transport, and bait-bucket days, with the trade-offs that matter.

Stop guessing which clarifier is safe for your fish, shrimp, or plants. Match the right method to your tank’s cloudiness type and avoid costly mistakes.

We tested five water conditioners on tap water with chlorine and chloramine. Seachem Prime wins for complete detox; here is the right bottle for your tank size.

We tested aquarium water conditioners for chlorine, chloramine, heavy metals, and fish stress, matching dose, bottle size, and slime-coat support to your tank.

We tested phosphate removers for reef tanks — granular media, liquids and pads — and picked the ones that lower phosphate without stressing corals.

We tested plug-in timers for freshwater and reef tanks. These picks keep a steady light schedule and fit a crowded aquarium outlet.