Fluval U4 - Internal Filter Air Diffusers Use 5 g (1 level

Use 5 g (1 level teaspoon) per 80 L (20 gallons) twice a week

accelerated coral growth

The functionality of the shape and the compact size are also suitable for confined spaces

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Fluval U4 - Internal Filter Air Diffusers Use 5 g (1 levelFeatures Designed for aquariums up to 65 US Gal 150 L Use as a primary filter for smaller aquariums, or supplementary filter for larger aquariums Position horizontally for shallow tanks, larger tanks with low water levels, or to create a decorative waterfall feature Position vertically against aquarium wall to create currents or customized flow patterns Convenient flip top lid allows for quick and easy access to filter cartridge for maintenance or