Maxspect Jump Gyre Flow Pump MJ-GF308 (1850 GPH) fit check
Maxspect Jump Gyre Flow Pump MJ-GF308 (1850 GPH) is a DC gyre flow pump rated 1850 GPH. On its own it supplies comfortable flow for about 95 gallons of soft coral, 60 gallons of mixed reef, or 35 gallons of SPS, before placement and mode settings.
Maxspect Jump Gyre Flow Pump MJ-GF308 (1850 GPH): fits roughly 30-75 gallon systems. Specs, compatibility math, sizing risks, and alternatives before you buy.
Who it is for
Good fit for
- ✓ 30-75 gallon systems, per the catalog fit range.
- ✓ About 60 gallons of mixed reef or 95 gallons of soft coral on its own.
Not a fit for
- ✕ Tanks under about 30 gallons; it is sized above them.
- ✕ Systems over about 75 gallons without adding capacity elsewhere.
- ✕ SPS tanks over about 35 gallons unless paired with more flow.
Listed features
- gyre/sheet flow
- 8.78 in length
- integrated controller
- multiple flow modes
Compatibility math
Turnover contribution
Example: 1,850 GPH contributes about 25x 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.
Professional fit context
- Check controllability, broadness of flow, glass thickness, GPH range, and whether two smaller pumps beat one large one.
- Maxspect Jump Gyre Flow Pump MJ-GF308 (1850 GPH) fits roughly 30-75 gallon systems; confirm that range against the final display volume, sump volume, and livestock plan.
Alternatives to compare
- Hydor Koralia 3rd Generation 1950 GPH Powerhead
1,950 GPH vs 1,850: more flow.
- AquaIllumination Nero 3 Wave Powerhead (2000 GPH)
2,000 GPH vs 1,850: more flow.
- IceCap 2K Gyre Flow Pump (2000 GPH)
2,000 GPH vs 1,850: more flow.
Livestock this affects
- Montipora
High flow need; plan strong, varied flow.
- Montipora digitata
High flow need; plan strong, varied flow.
- Bubble coral
Low flow need; keep this pump's output indirect nearby.
- Chalice coral
Low flow need; keep this pump's output indirect nearby.
Full spec snapshot
- Category
- Flow Pumps
- Build tier
- Balanced
- Estimated price
- $219
- Tank fit range
- fits roughly 30-75 gallon systems
- Format
- DC Gyre Flow Pump
- Maximum flow
- 1,850 GPH
Related reading
Questions
How many Maxspect Jump Gyre Flow Pump MJ-GF308 (1850 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 1,850 GPH rated, that is about 2 of these at full output, before return-pump flow and mode settings.
What tank size is the Maxspect Jump Gyre Flow Pump MJ-GF308 (1850 GPH) for?
ReefCrafter's catalog fit range for it is 30-75 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 Maxspect Jump Gyre Flow Pump MJ-GF308 (1850 GPH) against?
Hydor Koralia 3rd Generation 1950 GPH Powerhead (1,950 GPH vs 1,850: more flow); AquaIllumination Nero 3 Wave Powerhead (2000 GPH) (2,000 GPH vs 1,850: more flow); IceCap 2K Gyre Flow Pump (2000 GPH) (2,000 GPH vs 1,850: more flow).
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