I did 50% water changes, but I had a smaller tank. If you have .4 ppm
, and you do a 50% pwc
, you should have .2ppm, and so on. You can do 2 water changes a day if you need to. Not back to back, but spaced out. And make sure you use dechlorinator if you need to (city water) and keep the new water as close to the same temp as what's in the tank.
Just guess on the 50%. Take out half the water. But if you haven't done a pwc
in a while, only do about 15% so you don't shock your fish with a pH swing.