Quote:
Originally Posted by Mr OM
If you take out 50% of the water in your system and then top off you did a 50% water change, if you added 50% new water and drained the rest you just did a 25% water change.
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I only do 10-15% water changes a week
Quote:
Originally Posted by Kryptic4L
nope i was missing something, just messed me up because in my normal operations 1) I mix the water 2) then take out the water 3) then add fresh.
you are doing 2,1,3. For some reason I read it as you were mixing the water then draining the tank into the fresh water and then removing excess. 
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Right :-)