Hello! I have a 125 gallon tank with a RTC thats apprx 2 feet! I do regular water changes weekly! The problem is that the water wont turn CLEAR asap! Sometimes its stays murky water change to water change! One time is was cloudy for like 5 days and one day I woke up and it was CRYSTAL clear! Its was crazy! I cant understand it! Please tell me what this could possibly be! My cat is healthy and eating hes ok!My filtration is as follows!(2) penguin power filters 350(1) Cascade 1000 Canister(1) Eheim 2217 Canister