I am curious as to why you did such a radical tank cleaning. As far as I know that isn't in the

, unless you have some dreaded disease or something.
How long has your tank been running? It is really strange that all the tests came out 0. That indicates that the cycle has either never happened, or was grossly upset! You will likely soon be experiencing, as jaslemi said a full blown cycle, which will REALLY be hard on your fish. Keep testing, when the ammonia starts going up do 25-50% water changes every day.....Keep on top of it until the Ammonia and Nitrites go back down to 0 and the Nitrates go up to 5-10. Until then your tank is in the cycle and can be toxic to your fish.
Any other tank cleaning should be limited to vacuuming the gravel, and swishing the filter in discarded tank water once a week. You don't even want to change a filter unless you "seed" it next to the old filter first!