gear

We clipped a shelf of LED lights onto rimmed and rimless tanks to find honest coverage, useful timers, and dimming that keeps algae in check.

We tested 18-24 inch LED lights for 20-gallon tanks. Our top pick balances fit, dimming, and a natural sunrise-to-sunset timer.

Which remineralizer works for your shrimp? GH+ for Caridina, GH/KH+ for Neocaridina — avoid the costly species mismatch.

The right tank for cherry shrimp is long, low and gentle on flow. Our picks run from a 5-gallon kit to a rimless 3-gallon you build yourself.

We tested the fungus treatments worth considering. Our top pick is a dedicated hospital-tank liquid; the runner-up adds ich coverage for bigger tanks.

Swing-arm and float hydrometers for reef and marine tanks, compared on readability, repeatability and value, plus how to get a reading you can trust.

We tested pH and TDS/EC pens for freshwater aquariums and picked the most dependable options for accuracy, calibration, and everyday use.

We compared eight sinking algae wafers for plecos, snails, and shrimp. Hikari is our top pick for most tanks; here’s the right one for yours.