Ive got a 60gal bow front with an Oscar and Chocolate Cichlid. I havnt had any problems in terms of cloudiness, but for filters I use 2 side filters; an AquaClear 150 and 300, as well as an undertank filter which is absolutely awesome. Its a Fluval 205, and Ive had no problems whatsoever, even though my fish are perhaps the messiest fish on the planet. I also do 25% water changes once a week. I'd try getting an undertank filter, or replacing your filter media.