Fish jammed, noisy after 1 day, filtering performance super

The filter is easy to install. Cogiven template prevents Flasches Growing. Magnetic mount is super. Unfortunately, the corner filter has exactly the corner a round gap, my catfish swim should always pure all the way up and, unfortunately, can not go back. I'm now down closed with a foam.
The pump was totally silent on the first day. Meanwhile it rattles a bit.
Clean the filter is thank goodness not too often before, it's really to bring apart a bit awkward, the filter elements. Well but on the whole he is serving. The water outlet is infinitely adjustable and 90 ° tiltable.