02-05-2014, 08:43 AM
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The thing about having a fish tank is that it's an artificial environment, that we create, to mimic nature. Unfortunately, we have to help that along with some technology that nature doesn't need - filters, heaters, water changes,...
As stated earlier, we do need to help things along with water changes to remove solid waste products. How much is dependent upon the variables of your particular fish tank. It's different than someone else's, depending upon size of tank, biological load from the fish, the filtering approach you have, etc... That's a judgement call on your part, through trial and error.