It looks like your drain pipe is a bit too long Chris, heh heh. I'd say a half pound of FH's would thrive in your pond...Just pulling your leg a little. Could be your picture angle but your finish guy left a few inches directly behind your drain, it's higher than each side, hqad to find some fault, the rest looks so dang good. That's a going to be a nice pond when it fills, nice work.