Two Little Fishies PhosBan Reactor 550 Large fit check
Two Little Fishies PhosBan Reactor 550 Large is a media reactor from Two Little Fishies. Listed features: Upflow principle for efficient use of PhosBan or other chemical media; Ball valve for flow regulation with 180-degree rotating fittings; Dispersion plate prevents channeling via even water distribution.
Two Little Fishies PhosBan Reactor 550 Large: fits roughly 100-600 gallon systems. Specs, compatibility math, sizing risks, and alternatives before you buy.
Who it is for
Good fit for
- ✓ 100-600 gallon systems, per the catalog fit range.
- ✓ Planned, measured use matched to the system's real water volume.
Not a fit for
- ✕ Tanks under about 100 gallons; it is sized above them.
- ✕ Systems over about 600 gallons without adding capacity elsewhere.
- ✕ Fixing an algae or nutrient problem without testing first.
Listed features
- Upflow principle for efficient use of PhosBan or other chemical media
- Ball valve for flow regulation with 180-degree rotating fittings
- Dispersion plate prevents channeling via even water distribution
- Threaded lid design for quick servicing
- Hang-on-tank or below-aquarium mounting
Specs checked against saltwateraquarium.com.
Compatibility math
Build role
Example: Two Little Fishies PhosBan Reactor 550 Large belongs in the plan only if it solves a real stability or maintenance job.
ReefCrafter keeps optional upgrades behind core stability requirements.
Risk notes
- Skipping RODI planning because tap water is cheaper often turns into a more expensive algae fight.
Professional fit context
- Check source water, RODI stage count, salt volume, test cadence, and media dosing caution.
- Two Little Fishies PhosBan Reactor 550 Large fits roughly 100-600 gallon systems; confirm that range against the final display volume, sump volume, and livestock plan.
Alternatives to compare
- Bulk Reef Supply BRS GFO Carbon Reactor Deluxe
Catalog fit range 30-300 gallon systems (balanced tier).
- Bulk Reef Supply BRS GFO Carbon Reactor Dual
Catalog fit range 30-250 gallon systems (balanced tier).
- Bulk Reef Supply BRS Premium ROX 0.8 Aquarium Carbon 1 lb
Budget-tier alternative in the same category.
Full spec snapshot
- Category
- Water / Media
- Build tier
- Balanced
- Estimated price
- $125
- Tank fit range
- fits roughly 100-600 gallon systems
- Format
- Media Reactor
Related reading
Questions
What tank size is the Two Little Fishies PhosBan Reactor 550 Large for?
ReefCrafter's catalog fit range for it is 100-600 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 Two Little Fishies PhosBan Reactor 550 Large against?
Bulk Reef Supply BRS GFO Carbon Reactor Deluxe (Catalog fit range 30-300 gallon systems (balanced tier)); Bulk Reef Supply BRS GFO Carbon Reactor Dual (Catalog fit range 30-250 gallon systems (balanced tier)); Bulk Reef Supply BRS Premium ROX 0.8 Aquarium Carbon 1 lb (Budget-tier alternative in the same category).
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