I tied a sponge to the output of my eheim pickup 60 as it was too strong and knocking back my fish, will this effect the overall filtration or just dissipate the
Paul Talbot talking about the Eheim pick up filter - YouTube
Eheim Pickup 60 Internal Filter : Amazon.co.uk: Pet Supplies
Small, good and very practical | EHEIM GmbH & Co. KG. Leading aquarium manufacturer.