Hi new to this site and have a question..

[Enigma]

Originally Posted by MKLKT

For a 90 gallon you'll probably want at least a 20 gallon sump in order to fit the required equipment. The more space you have to move around in the stand/sump area the better, otherwise it gets frustrating and overcrowded really quick. Remember that the sump is only about half-full, so you aren't actually adding 20 gallons to the system size.

I run my sump at about 3/4 to keep my skimmer operating at optimum. You should see how close it gets when I shut my pumps off! I've maybe got a gallon of wiggle room (if I'm lucky). I don't ever let hubby see that.