Fluval Sea CP3 Wave Maker Circulation Pump

The Fluval Sea CP3 is a compact wave maker for aquariums up to 50 gallons. It mounts on a suction system, has a 270° adjustable nozzle for aiming flow, and is built for quiet, energy-efficient running in both freshwater and saltwater.

Why add circulation

Filters move water along a fixed path, so corners and the space behind rock often go still. Still water collects detritus and can hold less oxygen. A circulation pump adds current that sweeps those zones, keeps waste moving toward the filter and ripples the surface for better gas exchange. Reef keepers use it to carry food to corals; river-fish keepers use it to mimic a stream.

Aiming the nozzle

The nozzle turns through 270°, so you can send flow along the back glass, across the substrate or up toward the surface. Small changes in angle make a big difference. Start along the back wall, then adjust until debris stops settling in the corners.

Mounting

The suction mount makes setup and repositioning quick. Clean the glass with a scraper first so the cup seals well. Place it out of sight behind rockwork, but with clear space in front of the outlet.

Who it suits

The CP3 is a fit for nano reefs, mixed reefs and planted or river tanks within its 50 gallon range. On larger tanks, pair it with a second pump on the opposite side, or step up to a bigger model.

Upkeep

Remove the pump during a water change every month or two and rinse the impeller. Calcium and algae build-up slows it down and can add noise.

Compare

For a magnetic mount on a bigger tank, see the hygger Lite wave maker. For a basic, low-cost pump, see the AQUANEAT 480 GPH wavemaker.

If fish struggle against the current, turn the nozzle toward the glass so the flow spreads out before it reaches them.