Sasquatch, it is a 40 gal; as it is now, it is only holding 31gal so I have room for 9 gal more. Even if the check valve fails, there is plenty of room to hold any backflow. I will use the same auto top off I have now. The reservoir will be kept right above the return pump on a shelf... the float switches will be placed in the center section along with the phosban reactor and skimmer.
Brotha... 13.5"
I thought you were referring to the glass baffle
