mads wrote:
hey paul
I have my tank for 3years. In my tank i have 6 oscars,1 gaint courami(45cm big),1 tinfoil(sold the other 2 for the oscars),1 red tail cat fish and 2 plecostumos.My tank is a 650liters tank and have 1 pump(cascade witch pump 1400/hour).
how big are your oscars now? as necro had said, 145 IMP gal or 168 US gal tank is not big enough for 6 oscars plus tanksmates. regular water change plus good filtration helps you cope up with the loads of your stock for the meantime. however, the end result is that "presently, you have some issue on health". (oscar should grow around 15 inches long minimum in 2 years).
I chance my water every 2weeks and clean my tank every month
Any advice are welcome
without knowing your water parameters, this is the sensible thing to do,..... keep water change regularly.