Bluepet BLH-302 Aquarium Hang On Filter (5W) – 300L/H with Surface Skimmer

The Bluepet BLH-302 is a 5W hang-on-back (HOB) aquarium filter delivering up to 300 L/H, with a built-in surface skimmer that clears the oily film off the water while filtering debris — keeping small tanks clean, clear and well-oxygenated without taking up space inside the tank. Slim and quiet, it creates an oxygenating waterfall return and is easy to install and maintain — a great everyday HOB for nano and small community setups.

Why choose the Bluepet BLH-302?

• 300 L/H flow from an efficient 5W motor.
• Built-in surface skimmer removes the oily surface film.
• Waterfall return for surface oxygenation.
• Slim, space-saving HOB design.
• Quiet and easy to maintain.

Specifications

Which tanks is it best for?

With 300 L/H, the BLH-302 suits nano and small tanks up to roughly 70L, and the skimmer makes it ideal where an oily film forms on the surface. For more flow with a skimmer see the BLH-403 (500 L/H); for a basic smaller HOB, the BLH-301 (180 L/H). See canister vs HOB vs sponge.

How to set it up

Hang the filter on the back rim, prime it if needed, and plug in. Keep it running 24/7, and rinse the cartridge in old tank water (never tap water) when flow slows. See how to install an aquarium filter.

Frequently asked questions

What size tank is the BLH-302 for?

Nano and small tanks up to roughly 70L, based on its 300 L/H flow.

What does the surface skimmer do?

It removes the oily film from the water surface, improving oxygen exchange and clarity.

Is it quiet?

Yes. The slim design runs quietly.

How do I maintain it?

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

Should it run all the time?

Yes, keep it running 24/7 to protect the beneficial bacteria.

New to filtration? Read our complete aquarium filter guide and types of aquarium filters.