Hi the tank has been up and running for around 3 months filtration is an Eheim 2329 I did make the mistake of putting in filter pads and taking them out every week to clean them but now I have only Ehfisubstrat and a green wiry sort of pad made for it at the top then the green lattice on top of that I have 21 fish only half grown in a 450ltr tank I have cut down on the feeding cichlid food and some food that I have cooked up which is shrimps peas carrots spirlina garlic, flake food,tropical tucker,mysis they get a bit of a variety feeding once a day but now missing out the odd day my ammonia and nitrites are good ph is 7.8 to 8 dkh is 3to4 its been cloudy for most of the time looked like it was coming right then went cloudy again I am now going to leave it alone apart for once a week water changes and checking ph etc I had washed the Ehfisubstrat and maybe be I shouldn't have cheers for your reply