(tom) wrote:
I have a 220 gallon native tank, I am changing 4 gallons a day which
works out to about 50 percent monthly. Is this Ok? 2 emperor 400s and
air lifts. I dont add any chemicle, just tap water and a teaspoon of
noniodine salt per gallon. 2 months and everyone is happy.

Daily changes sound like a lot of extra work, but there's certainly unlikely to
be any harm with 2% water changes per day. If your tap water is chlorinated,
you probably should be adding some dechlor, 'tho, otherwise you're added a
source of stress to your fish. Probably should be vaccing the gravel on
occasion, too.