Fluval U4 Underwater Filter Bubble Magus 1000ml size is suitable for

1000ml size is suitable for larger systems or ongoing reactor refills

and we recommend at least 150 gallons or larger for a group

limited aeration or alkalinity imbalance

which increases silica in that volume by approximately 0

Clear Glass Inflow and Outflow for Planted Aquariums

Fluval U4 Underwater Filter Bubble Magus 1000ml size is suitable forFluval 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