Red Sea Reefer 425 G2+ System (91 Gal) fit check
Red Sea Reefer 425 G2+ System (91 Gal) is a 91-gallon sumped reef ready measuring 47x25.5x55.7 in. It ships with a stand, a sump or rear filtration, and ATO; plan separately for return pump, lighting, and skimmer. At that volume ReefCrafter's math points to 230-455W of heating and about 2,730 GPH of mixed-reef flow.
Red Sea Reefer 425 G2+ System (91 Gal): fits roughly 91 gallon systems. Specs, compatibility math, sizing risks, and alternatives before you buy.
Who it is for
Good fit for
- ✓ Keepers who want filtration space built in rather than plumbed later.
- ✓ Stocking plans that include larger fish such as tangs, once the tank is mature.
Not a fit for
- ✕ Buyers expecting a complete kit; it still needs return pump, lighting, and skimmer.
Listed features
- rimless beveled glass
- cabinet and sump included
- ReefATO+
Compatibility math
Downstream requirements
Example: 91g points to about 230-455W of heat and 2,730 GPH mixed-reef flow.
The tank is the constraint every other component has to satisfy.
Risk notes
- A tank can look affordable until you account for the light spread, skimmer room, stand access, and upgrade path it forces.
- Price is marked as estimated, so verify current vendor pricing before treating the budget as final.
Professional fit context
- Check display volume, total volume, footprint, included sump/stand, and what equipment is still missing.
- Red Sea Reefer 425 G2+ System (91 Gal) fits roughly 91 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
- Waterbox MARINE X 110.4 Aquarium System (79 gallons)
79 gallons vs 91: a smaller display.
- Waterbox INFINIA Frag 125.4 Aquarium System (78 gallons)
78 gallons vs 91: a smaller display.
- Red Sea Reefer Peninsula 500 G2+ Aquarium System (109 Gal)
109 gallons vs 91: a larger display.
Livestock this affects
- Green mandarin dragonet
75+ gallon minimum; fits this 91-gallon display.
- Kole tang
75+ gallon minimum; fits this 91-gallon display.
- Tomini tang
75+ gallon minimum; fits this 91-gallon display.
- Copperband butterflyfish
Needs 100+ gallons; too large for this tank.
Full spec snapshot
- Category
- Tanks
- Build tier
- Premium
- Estimated price
- $2,999 est.
- Tank fit range
- fits roughly 91 gallon systems
- Format
- Sumped Reef Ready
- Display volume
- 91 gal
- Footprint
- 1,199 sq in
Related reading
Questions
What equipment comes with the Red Sea Reefer 425 G2+ System (91 Gal)?
The catalog lists a stand, a sump or rear filtration, and ATO as included. You still need return pump, lighting, skimmer, and flow pumps.
What size heater does the Red Sea Reefer 425 G2+ System (91 Gal) need?
At 91 display gallons, ReefCrafter's 2.5-5 W per gallon band gives 230-455W, ideally split across two heaters of about 115W.
What tank size is the Red Sea Reefer 425 G2+ System (91 Gal) for?
ReefCrafter's catalog fit range for it is 91 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 Red Sea Reefer 425 G2+ System (91 Gal) against?
Waterbox MARINE X 110.4 Aquarium System (79 gallons) (79 gallons vs 91: a smaller display); Waterbox INFINIA Frag 125.4 Aquarium System (78 gallons) (78 gallons vs 91: a smaller display); Red Sea Reefer Peninsula 500 G2+ Aquarium System (109 Gal) (109 gallons vs 91: a larger display).
Similar fit checks
