My baby convicts are about 2 weeks old, do i continue to do water changes? The water looks ucky, due to the fact i have cut off undergravel filter. i worry because i am putting so much crushed up flakes in there as fry food. wanted to ask before i changed it. Oh, it's a 20 gallon tank with aquaclear 50....i just tested PH 8.2...not sure on the rest of perimeters at the moment, sorry.