Choose your route
Calculation
Reef tank flow and turnover calculator
Separate sump return turnover from in-tank circulation, then see what delivered flow actually means.
Return-pump sizing
How to size a return pump for head height
Use vertical lift, pipework, elbows, outlets and the pump curve instead of its zero-head headline.
Return comparison
Best reef return pumps in the UK
Four current UK options compared by delivered-flow range, head height, control, power and price.
Wavemaker comparison
Best reef wavemakers in the UK
Broad-flow, gyre and controllable propeller options for different tank footprints.
Nano decision
Best nano reef wavemakers
Small-pump shortlists where glass thickness, flow spread and low-speed control matter most.
THE FLOW RULE
Return flow is not coral flow.
The return pump feeds the display and filtration loop. Wavemakers create internal movement, lift detritus and prevent low-flow zones. A powerful return pump cannot substitute for sensible in-tank circulation.