I did see yours on the OSA site and he is awesome looking! The tank has a 5'x3'(60"x36") footprint and is 2'(24") tall. I have never seen a Gold Clown in person before so I thought he would be a interesting addition to the tank. There will also be a Cichla Ocellaris in there as well, but the Gold Knife at my store is only about 4" or 5" so he might go in a grow-out for a bit. I think he'd be fine in the 225g as is, but just to assure he don't get snapped at by the larger Polys I might just go ahead and grow it out for a couple months.