In my homestead, the "Drew's Pairs/maybe pairs" thread, all those tanks are done with shower curtain backgrounds. I just ended up using white because its best given that I raise pigeons and the lighter I can keep it the better ya know? I have some on the other side done in a light green that I really like but no pictures of those tanks up, they are my regular stock and grow out tanks, i only have pictures up of the breeding side of things right now.