I know it looks unstable butthe one piece on the left side it very flat. So that piece is supporting it all, but the epoxy should hopefully hold it. I can't hide that pump because that runs my refugium. I wish I could though. I'm not sure if I want to leave it like two mounds or get just another piece or two, maybe three and stack them there. I'd like to get some marshall island rock, but can't afford it right now. This ich ordeal has drained me!