filteration advice sought please

With a bit of luck by tomorrow I will have an ehim professions2 2026
(designed to filter 350 litre) for a juwel 180 litre tank (with juwel
filter removed)

Question - will this be enought filteration/aeroation or should I add
a large sponge filter inside the tank as well driven by an air pump,
which will aeroate the water and give some more filteration as well.
Noise is not an issue here as the tank is in the garden shed

Fish will be between 15-20 lake malawa ciclids with a lot of rock
present


Cheers


Brian