Reviewed 2026-05-01 · comparison
MP40 vs Nero 5 flow pump comparison
Choosing between EcoTech MP40 and AI Nero 5 is a fit decision, not a lab result: tank size, reef goal, budget tier, failure mode, and upgrade path decide which one belongs in the build.
Choose EcoTech MP40 when
- Larger mixed reefs where high-flow headroom, external motor heat control, and broad ecosystem integration matter.
- Tanks with glass thickness and placement that fit the dry-side/wet-side mounting design cleanly.
- Builds where two pumps can create wide, alternating flow without crowding the display.
Choose AI Nero 5 when
- Nano to mid-size reefs where compact in-tank pumps, lower entry cost, and simple app control are the better fit.
- AIO or shorter tanks where a small pump body can hide without overpowering LPS or soft coral zones.
- Builds that need controllable flow but do not need MP40-class output or external-motor design.
Fit math
- Start with the display-flow target for the coral goal, then compare usable GPH after placement and intensity limits.
- Check glass thickness, cord routing, wet-side clearance, and whether two smaller pumps beat one stronger pump.
- Mixed reefs usually benefit from varied flow lanes, not simply the largest headline GPH number.
Risks before buying
- A powerful pump can still make bad flow if it blasts one coral zone while leaving dead spots behind rockwork.
- A compact pump can become the expensive path if the tank soon needs multiple units to hit the same turnover target.
- Controller features do not fix poor pump placement or a livestock plan that needs calmer zones.