Thanks. Its currently at around 1600gals, but the structure had 2000 gals in when it used to be 6ft deep. There was issues though, leaking among them, that made me settle with 5ft.
Thanks. The problem was Pond Armor. There is apparently a tiny bit of movement when I climb in and out of the thing, and this caused stress cracks between pieces of wood. I spent a long time trying to get the epoxy to work, including siliconing the stress points, but its too brittle. Finally, I switched to Sanitred and it worked right the first time. It was up for a while before it leaked as I try to avoid climbing into it. The Sanitred is immune to any flexing.