Sera Internal Filter L300
The Sera Internal Filter L300 is an air-driven sponge filter designed for efficient aquarium maintenance. It functions as a mammoth or airlift pump, using an air pump to push water through a hose into a standpipe. As air rises, it creates a flow that pulls aquarium water through a fine sponge. The sponge provides optimal surface area for mechanical filtration and hosts beneficial nitrifying bacteria that help break down pollutants.
Designed to protect tiny larvae and juvenile fish, this filter prevents them from being sucked into standard filters due to their small size and unique swimming behaviors. It is ideal for tanks with young or sensitive fish species.
| Feature | Detail |
|---|---|
| Filter Type | Internal sponge filter |
| Operation | Air-driven, airlift mechanism |
| Filtration Type | Mechanical |
| Bacteria Support | Yes, nitrifying bacteria colonization |
| Best For | Small to medium tanks with juvenile fish and larvae |
FAQ
Can the Sera Internal Filter L300 be used with a standard air pump?
Yes, the filter is designed to work with a standard air pump to create the airlift flow.
Does the sponge support beneficial bacteria growth?
Yes, the fine sponge surface supports the colonization of nitrifying bacteria essential for breaking down ammonia and nitrites.
Is this filter suitable for tanks with small fish or fry?
Yes, it is specifically designed to protect tiny larvae and juvenile fish from being sucked into the filter.

Sam Mackenzie –
The filter works well in my 10-gallon tank with neon tetras and baby guppies. The sponge doesn’t clog easily and the water flow is steady. I noticed the fry stay safe and don’t get sucked in. Good for beginners with young fish.
Sonia Fraser –
It’s quiet and effective. I use it with a small air pump and the water circulation is smooth. The bacteria build-up is visible after a few weeks. Not the strongest filter, but perfect for a small tank.
Lillian Black –
Great for fry and juvenile fish. The filter maintains clean water without disturbing the fish. I’ve kept my baby angelfish safe for over two months. Easy to clean and maintain.