hello im new to my fish hobbie...bout 3 weeks. i have a 60 gallon with up to 90 gallon filter a 250 watt jager heater ( tank is kept at 79), i used the biozyme to start bacteria and cycle. anyways my fish are... arowanna (4 inches), demasoni, 2 clown loaches, 2 catfish, gold face, red lafubu, black zaire, red severum, blue dolphin, tire track eel, albino casadera, 2 sailfin mollies, red tail shark, electric yellow.... quite a bit of fish for this size tank. anyways my question is.....is it ok to stir up my rocks every day to remove wastes and unused food from tank and how often should i do water changes ...all my fish are babies