Ask ten reefers how to move water in a tank and you’ll get ten answers. But the terms get thrown around loosely, and new hobbyists often buy the wrong pump for the job. Here’s a clear, practical look at wavemakers versus powerheads — what each one actually does, how much flow your reef needs, and how to place your pumps so corals thrive.
Powerhead vs wavemaker: what’s the difference?
A powerhead is a simple submersible pump that pushes a narrow, high-velocity jet of water in one direction at a fixed speed. It’s cheap and strong, but that tight stream can blast corals in one spot and leave dead zones everywhere else.
A wavemaker (also called a circulation or flow pump) is built specifically for aquarium flow. It moves a wider, gentler column of water and — crucially — most modern wavemakers are controllable: you can tune the strength and run pulsing or wave modes that change the flow over time. That variable motion is far closer to a real reef and keeps detritus suspended so your filtration can remove it.
For a planted or fish-only freshwater tank, a basic powerhead is often fine. For a reef tank, a controllable wavemaker is almost always the better tool — it’s gentler on corals and far more effective at eliminating dead spots.
How much flow does a reef tank need?
Flow is usually described as “turnover” — how many times your total water volume is circulated per hour. Rough guidelines:
- Fish-only / soft corals: around 10–20× turnover per hour.
- LPS (large polyp stony) reef: about 20–30×, with gentle, indirect flow.
- SPS (small polyp stony) reef: 30–50× or more, with strong, randomised flow.
So a 100 L mixed reef wants very roughly 2,000–3,000 L/h of in-tank flow (on top of your return pump). The exact number matters less than the type of flow: you want broad, varied, indirect movement — not a fire-hose pointed at a coral.
Placement: where dead zones hide
Even the right pump fails if it’s aimed poorly. A few rules of thumb:
- Point wavemakers slightly across or along the glass, not straight at the rock — let the flow wrap around the aquascape.
- Aim to keep sand lightly rippling and detritus lifting off the rock, without sandstorms.
- Watch for dead spots (where detritus settles) and stagnant coral tissue; reposition until they clear.
- On larger tanks, two opposing pumps running in alternating pulses create a gentle, randomised wave that beats a single strong stream.
Why controllability wins
The single biggest upgrade from an old-school powerhead is control. A tunable DC wavemaker lets you dial flow up as corals grow, run calmer “night” modes, and pulse the output so the tank never has the same steady current twice. That variability reduces dead zones, keeps corals happier, and is quieter and more energy-efficient than a maxed-out AC powerhead.
Choosing the right Mantis wavemaker
Our Mantis wavemaker range covers every tank size with quiet, controllable DC pumps:
- Tourbon 60 — compact 4,000 L/h (1,056 GPH) flow for nano and small tanks (40–60 cm).
- Hydrus-15 — 8,000 L/h gyre-style flow for 50–150 L reefs.
- Hydrus-25 — 12,000 L/h for 150–300 L mixed reefs.
- ReefVane-25 — a cross-flow pump that sheets a smooth, laminar current across the whole tank, ideal for SPS.
Hydrus gyre pumps are great all-rounders for broad, tunable flow; ReefVane cross-flow pumps shine when you want an even, front-to-back sheet of water and a tidy single-pump look.
Quick recommendation
- Nano / soft corals: one small wavemaker like the Tourbon 60 or Hydrus-15.
- Mixed LPS reef: a Hydrus-25, or a ReefVane for smooth laminar flow.
- SPS-dominant: stronger, randomised flow — often two pumps or a ReefVane plus a gyre.
Not sure which fits your tank? We’re an authorized Canadian dealer for Mantis, based in Toronto with fast Canada-wide shipping and free local GTA pickup. Tell us your tank size and what you keep, and we’ll help you set up flow that keeps your corals open and your water clean.
👉 Shop the range: Wavemakers at Fins & Friends · and don’t forget a matched return pump for your sump.
Questions? Reach us at finsnfriends.ca or (647) 607-7892.