Blue Pet BL-8400F Aquarium Internal Liquid Filter 25 watts

The Blue Pet BL-8400F is a powerful 25W internal aquarium filter delivering up to 1000 L/H, designed to keep medium-to-large tanks crystal-clear with strong mechanical and biological filtration. Fully submersible, it pulls water through a multi-stage sponge cartridge that traps debris and hosts beneficial bacteria, while the aeration outlet boosts oxygen. Built for higher bio-loads, it is a dependable workhorse for busy community tanks.

Why choose the Blue Pet BL-8400F?

• Strong 1000 L/H flow from a 25W motor for higher bio-loads.
• Mechanical + biological filtration via the sponge cartridge.
• Fully submersible with an aeration outlet for oxygenation.
• Adjustable flow direction.
• Reliable for medium-to-large community tanks.

Specifications

Which tanks is it best for?

With 1000 L/H, the BL-8400F suits medium-to-large aquariums — around 4× turnover puts it at tanks up to roughly 250L. For even higher capacity see the BL-8500F (35W/1500 L/H, 4-stage). See our aquarium filter guide and most powerful aquarium filter.

How to set it up

Mount it inside the tank on the suction cups, fully submerged, and plug in. Keep it running 24/7, and rinse the sponge cartridge in old tank water (never tap water) when flow slows. See how to clean an aquarium filter.

Frequently asked questions

What size tank is the BL-8400F for?

Medium-to-large tanks up to roughly 250L, based on its 1000 L/H flow.

Is it good for messy fish?

Yes. The strong flow and sponge filtration handle higher bio-loads well.

Is it fully submersible?

Yes. It runs underwater inside the tank on suction cups.

Can I adjust the flow direction?

Yes. The outlet direction is adjustable; flow can be tuned for your layout.

How often should I clean it?

Rinse the cartridge in old tank water when flow drops, usually every 2–4 weeks.

New to filtration? Read our complete aquarium filter guide and how aquarium filters work.