Internal Aquarium Filter sera F 400 (adjustable) – model SE-06821

The adjustable internal aquarium filter sera F 400 (model SE-06821) is a compact, submersible unit designed for mechanical and biological filtration inside freshwater and marine tanks. Intended for continuous operation, the filter provides water circulation and improved clarity by removing suspended particles and supporting beneficial bacterial colonization. Its adjustable flow control allows adaptation to different tank sizes and types of aquarium livestock while mounting directly inside the aquarium to save external space.

Advantages

The sera F 400 combines mechanical prefiltration with a biological filter chamber to reduce debris and promote nitrifying bacteria development. Its adjustable flow mechanism enables precise control of water movement to suit plants, fish, or invertebrates. The compact internal design simplifies installation and maintenance without requiring an external canister or sump. Low operational noise and energy-efficient performance make it suitable for continuous use in home aquariums.

Suitable for

• Small to medium freshwater aquariums that require compact internal filtration
• Marine tanks where moderate circulation and biological filtration are needed
• Planted aquariums that benefit from adjustable flow to protect delicate plants
• Tanks with community fish or invertebrates that prefer gentle to moderate current

Key specifications

• Type: Internal, submersible aquarium filter
• Filtration stages: Mechanical and biological
• Flow control: Adjustable output to regulate water circulation
• Mounting: Inside-tank installation with suction or bracket system
• Intended use: Continuous operation for water clarification and biological filtration

How to use

Install the sera F 400 inside the aquarium at a stable position on the glass using the included mounting system, ensuring the unit is fully submerged to the recommended level. Connect to a suitable power source and adjust the flow control to the desired output for the tank inhabitants and layout. Place mechanical filter media in the prefilter section and biological media in the biological chamber as specified by the manufacturer. Regularly inspect and clean the mechanical media to prevent clogging and maintain flow, while leaving biological media mostly intact to preserve beneficial bacteria colonies.

Usage recommendations

For best results, match the filter output to aquarium volume and livestock needs: lower flow settings for delicate plants and small fish, and higher settings for tanks needing stronger circulation. Perform periodic partial media rinses in aquarium water to retain nitrifying bacteria and avoid full replacements of biological media. Monitor water clarity and adjust flow as tank conditions change.