lighthouse39183;3088916; said:I have one on my 50g and I have just a little more than 4.5" clearance. It's a little difficult to get the filter off of the tank and back on sometimes. As long as you don't have a canopy you should be fine.
lighthouse39183;3088952; said:I just measured and I have 4.75" from the tank to the wall. I have at least a half inch to move the filter to level it.

dct3416;3088971; said:I can't find a tape measure at the moment but I used this guide when I was planning out my latest tank.
http://www.petsolutions.com/Info.aspx?id=401