Posted: Mon Jun 02, 2008 2:15 pm
I now have two big tanks, 75 and 90, and I'm kind of just getting into the swing of things for cleaning both. I just did the first 100% water change in the 90 gal, after about 4 months, and a 100% water change in the 75 after about the same, maybe a bit longer. I do 25% water change every couple of weeks, sometimes longer. And then, every few partial water changes I do 50% instead of 25%.
Your biggest indication on when to change is the nitrate levels. When your nitrate starts getting high, it's time to change.
And as for the cloudy water when you do a full tank change(also called new tank syndrome), I have a way of avoiding that, although some say I've just been lucky. I put my biomedia in a bucket of tank water while I'm cleaning the filter + tank. You just have to make sure you run dechlorinated water through the filter, and not straight from the tap.
Ralpheal, "The 'L' is silent."
Frankie, "Young at heart."