Alright I just modified the stand of a 55 gallon tank to accommodate a sump of 12" wide. This really opens my options and I think I'll be going with a 20 long. Now that I have this plan finalized I can figure out exactly what pump and size holes to drill, etc. I'm thinking a Mag 7 since at 4 feet head height it pumps 480 gph. The 55 gallon tank plus 15 gallons of the sump is 70, I figure I can use a ball valve to restrict flow down to ~360 gph. If that would damage the pump I'm thinking about running a Y and sending some water back to the refugium. If I drill the return at 1/2" I should drill the overflow at the same width right? The bottom of my tank is tempered so I'm drilling in the top sides of the back.
Thanks
Thanks