Fluval U4 Underwater Filter Substrates & Decor Select the overflow according to

Select the overflow according to the actual return-pump flow reaching the aquarium after head-pressure loss

Compact reef lighting platform: Ideal for nano reef aquariums

and organic chemicals

25 API Ammonia Test Strips

Fluval U4 Underwater Filter Substrates & Decor Select the overflow according toFluval U4 Underwater Filter The Fluval U4 Underwater Filter is the largest Fluval U Series internal filter, designed for aquariums up to 65 US gallons 240 L with powerful 3 stage underwater filtration, adjustable 3 way flow control, and flexible vertical or horizontal placement. High Capacity U Series Internal Filtration The U4 provides the strongest flow and largest aquarium rating in the U Series, making it a useful primary filter for larger