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Fluval FX4 Canister Filter
Model: FX4 · US configuration
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The middle FX external canister is listed for aquariums up to 250 US gallons and adds a utility drain valve to the two-basket design.
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Explore this buying guide ↗Why consider this model?
- A middle FX configuration for a compliant below-tank installation when its up-to-250-gallon ceiling, 1-gallon media baskets and built-in gravity drain are useful to the separate aquarium and service plan.
Tradeoffs to weigh
- The published capacity is an upper ceiling rather than a lower-and-upper range, and this broad, 16.5-inch-tall canister needs planned service clearance, a safe drain destination and disciplined hose routing.
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