Hang on filters can be hung either at the side or at the back of the aquarium. They have a tube going into the water which is the inlet and they have an outlet which lets filtered water out from the filter to the aquarium.
Best suited for small tanks.
This hang on back filter also comes with a sponge for the inlet pipe, hence it will prevent shrimps, snails and baby fish from getting sucked into the filter.
The flow in this filter is rated at 250lph which is not massive, but is enough for aquariums 30-40L if lightly stocked.
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