I recently returned to tropical fish after many years. The new technology is hard to get used to using. My main issue is my Eheim ecco 2236. It doesn't come close to its pumping output, even after cleaning. My tank is about 8 months along, PH is 7.6, nitrites are 0, ammonia is 0, nitates are 0. GH
are on the high side. The filter is not very dirty when I check it but I do have trouble removing all the air. need Input.