I have a 37g oceanic (24" long, 18" wide, 21" tall) that I just took down. It's drilled in the back for a closed loop with three holes. One 1" hole in the middle and a 1" hole in each corner in the back. The back is painted black. It's got a few small scratches in the upper front corner, but they aren't bad. I'm only looking for $35 for it. Let me know if you're interested.