Fluval U2 Underwater Filter Loc-Line & Returns if it falls onto its

if it falls onto its back on the aquarium's sand it is not physically able to flip over and must be assisted

0°F / -50

Use when high ammonia is detected or when adding new tap water

Use 1 capful or 5 ml for every 200 L (50 US gallons) daily or as needed to reduce ammonia

sump stability and nutrient export goals rather than aquarium volume alone

Fluval U2 Underwater Filter Loc-Line & Returns if it falls onto itsFluval U2 Underwater Filter The Fluval U2 Underwater Filter is a compact internal aquarium filter designed for aquariums up to 30 US gallons 110 L, providing 3 stage filtration, water movement, and aeration where external filtration is not possible or not preferred. Compact Internal Filtration for 30 Gallon Aquariums The U2 installs fully inside the aquarium, making it a practical choice for tanks where rear clearance, cabinet space, or external