The VorTech MP40 and the AI Nero 5 are the two powerheads most reefers cross-shop in the $250–$450 range. They're closer than the price gap suggests — both are Mobius-controlled propeller pumps from the EcoTech family — but they differ in three ways that decide the purchase: flow ceiling, motor placement, and battery backup.
Head to head
All specs and prices verified July 2026.
| Spec | VorTech MP40 mQD | AI Nero 5 |
|---|---|---|
| Max flow | 4,500 GPH | 3,000 GPH |
| Power draw | 9–38 W | up to 30 W |
| Recommended tank | 50–500 gal | 40–100 gal |
| Motor | Dry, external (magnet-coupled) | All-in-tank, integrated controller |
| Max glass thickness | 0.75 in | 0.63 in |
| Control | Mobius | Mobius / myAI / Bluetooth |
| Battery backup | EcoTech Battery Backup (native) | No native option (see below) |
| Price | $431.99 | $259.99 |
Both are controllable propeller pumps; figures are each pump's rated maximums. The MP40's motor sits outside the tank; the Nero 5 houses everything in one in-tank unit.
RULE OF THUMB
The headline difference: the MP40 mQD moves 4,500 GPH to the Nero 5's 3,000 and mounts its motor outside the tank — but it costs $431.99 to the Nero 5's $259.99, a $172 premium. Both run on Mobius, so either drops into an EcoTech/AI-controlled tank.
Where each one wins
Flow ceiling. The MP40 tops out at 4,500 GPH versus the Nero 5's 3,000. On a tank up to about 100 gallons the Nero 5 has plenty of headroom; past that, or for SPS that wants 40–60× turnover, the MP40's ceiling matters.
Motor placement. The MP40 uses a dry, magnet-coupled motor that mounts on the outside of the glass — nothing but the wet-side rotor is in the water, which some keepers prefer for aesthetics and for keeping heat out of the tank. The Nero 5 puts the whole unit, controller included, inside the tank on a magnet. Fewer cords, but more hardware in view.
Price. The Nero 5 is $172 cheaper. For a single powerhead on a mixed reef under 100 gallons, that's a real gap with no performance penalty.
The battery-backup gap most people miss
Here's the buying detail that doesn't show up on spec sheets. If keeping flow alive during a power outage matters — and for SPS it does — the two pumps are not equal:
- The MP40 runs natively on the EcoTech Battery Backup ($259.99), which powers VorTech pumps directly and keeps them running at reduced speed for many hours during an outage.
- The Nero 5 has no clean battery-backup path. The EcoTech Battery Backup powers EcoTech pumps only. And the popular near-universal alternative, the IceCap Battery Backup v3 ($169.99), explicitly lists the AI Nero as not compatible.
So if outage protection is on your list, the MP40 has a supported answer and the Nero 5 does not — a factor easily worth part of the $172 price gap for an SPS keeper.
COMPATIBILITY TRAP
The EcoTech Battery Backup powers VorTech pumps (including the MP40) natively, but the IceCap Battery Backup v3 explicitly does NOT support the AI Nero. There is no easy battery-backup path for a Nero 5 — plan for that if you keep SPS.
Who should buy which
Buy the AI Nero 5 ($259.99) if:
- Your tank is 100 gallons or less
- You want the lowest price with no real performance loss at that size
- You're fine with an all-in-tank unit and don't need outage backup
Buy the VorTech MP40 mQD ($431.99) if:
- Your tank is over 100 gallons, or SPS needing 40–60× turnover
- You want the motor out of the water
- You want native EcoTech battery-backup support
- Your glass is up to 0.75 inches thick (the Nero 5 tops out at 0.63)
Bottom line
For most mixed reefs under 100 gallons, the Nero 5 is the smarter buy — same Mobius ecosystem, plenty of flow, $172 cheaper. Step up to the MP40 for larger or SPS tanks that need the higher ceiling, the external motor, or battery backup. Not sure how much flow you actually need? Start with the flow calculator, see the full field in best wavemaker, and size your whole system in the System Builder.
Flow ratings, dimensions, ecosystem and battery-backup compatibility verified July 2026 (manufacturer sites, Bulk Reef Supply, CoralVue, AquaCave). Battery-backup compatibility is from IceCap/CoralVue and EcoTech published compatibility lists. Re-check pricing before purchase.