Tunze Stream 6155 Controllable (3700 GPH) fit check
Tunze Stream 6155 Controllable (3700 GPH) is a DC controllable powerhead rated 3700 GPH adjustable. On its own it supplies comfortable flow for about 185 gallons of soft coral, 125 gallons of mixed reef, or 75 gallons of SPS, before placement and mode settings.
Tunze Stream 6155 Controllable (3700 GPH): fits roughly 120-300 gallon systems. Specs, compatibility math, sizing risks, and alternatives before you buy.
Who it is for
Good fit for
- ✓ 120-300 gallon systems, per the catalog fit range.
- ✓ About 125 gallons of mixed reef or 185 gallons of soft coral on its own.
Not a fit for
- ✕ Tanks under about 120 gallons; it is sized above them.
- ✕ Systems over about 300 gallons without adding capacity elsewhere.
- ✕ SPS tanks over about 75 gallons unless paired with more flow.
Listed features
- DC controllable
- wide-flow
- included controller
- premium German build
Compatibility math
Turnover contribution
Example: 3,700 GPH contributes about 49x turnover on a 75g tank before placement and mode settings.
The planner adds all flow pumps together and compares the total to the reef goal.
Risk notes
- Too little flow leaves dead spots. Too much direct flow can strip tissue from LPS and irritate soft corals.
- Price is marked as estimated, so verify current vendor pricing before treating the budget as final.
Professional fit context
- Check controllability, broadness of flow, glass thickness, GPH range, and whether two smaller pumps beat one large one.
- Tunze Stream 6155 Controllable (3700 GPH) fits roughly 120-300 gallon systems; confirm that range against the final display volume, sump volume, and livestock plan.
- Treat the displayed price as a budget placeholder until a reviewed vendor page confirms current pricing.
Alternatives to compare
- Jebao OW-40 Wave Maker
3,963 GPH vs 3,700: more flow.
- Jebao SLW-30 Compact Wave Maker
3,434 GPH vs 3,700: less flow for smaller systems.
- AquaIllumination Nero 7 Wave Powerhead (4000 GPH)
4,000 GPH vs 3,700: more flow.
Livestock this affects
- Pocillopora coral
High flow need; plan strong, varied flow.
- Red montipora capricornis
High flow need; plan strong, varied flow.
- Harlequin shrimp
Low flow need; keep this pump's output indirect nearby.
- Mushroom coral
Low flow need; keep this pump's output indirect nearby.
Full spec snapshot
- Category
- Flow Pumps
- Build tier
- Premium
- Estimated price
- $549 est.
- Tank fit range
- fits roughly 120-300 gallon systems
- Format
- DC Controllable Powerhead
- Maximum flow
- 3,700 GPH
Related reading
Questions
How many Tunze Stream 6155 Controllable (3700 GPH) pumps does a 75 gallon mixed reef need?
A 75 gallon mixed reef wants about 2,250 GPH of total flow by ReefCrafter's 20-40x rule. At 3,700 GPH rated, that is about 1 of these at full output, before return-pump flow and mode settings.
What tank size is the Tunze Stream 6155 Controllable (3700 GPH) for?
ReefCrafter's catalog fit range for it is 120-300 gallon systems. Confirm that against your final display volume, sump volume, and livestock plan rather than the box label alone.
What should I compare the Tunze Stream 6155 Controllable (3700 GPH) against?
Jebao OW-40 Wave Maker (3,963 GPH vs 3,700: more flow); Jebao SLW-30 Compact Wave Maker (3,434 GPH vs 3,700: less flow for smaller systems); AquaIllumination Nero 7 Wave Powerhead (4000 GPH) (4,000 GPH vs 3,700: more flow).
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