Ok, my tank finally finished a fish cycle at about 6 weeks Yay! (I know... fairly typical time, but always seems longer due to all those PWC's ). I did not lose any fish. I have mainly guppies, two axelrods, 2 tetras, and one algae eater in a 20 gallon tank. My ammonia and nitrites are at 0 PPM, my nitrates are at 10 PPM, and my pH is 7.0. My question is, how often does everyone do a PWC change after their cycle finishes? I had planned on doing a 10-15% once a week just so I can vacuum any leftover food or waste out. Is this typical, or are there any other recommendations out there?