Dick wrote:

Are there any guidelines by how much (50%, 100%?) of the tanks water you
change out, how often, any other tips and or suggestions!

I have 5 tanks varying from 10 to 75 gallon.**I*change*20%*twice
weekly, I neglect filter cleaning in favor of water changes.


I do a 10%-15% water change once a week. I do a minor filter clean, i.e.
rinse out the sponges, twice a month. Every other month I do a complete
filter disassemble and clean.

My tanks are all heavily planted. If yours are not, more frequent water
changes should be done.

--
It's turtles, all the way down