Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
What do you mean 'balance out'?
The bacteria do not mind water changes.
I have done something close to 100% water changes (oops! poor fish were flopping in the low spots in the tank) and there was not even a blip in the nitrogen levels.
I more commonly do 50% water changes with never a problem.
I have moved tanks the way you want to, draining 75% of the water and refilling with new water. Not a problem.
All the posts above are right: There is very little nitrifying bacteria in the water. Do as large a water change as you need to, as long as the GH, KH, TDS, pH are the same.