I have 4 Geophagus Sveni and 6 Silver Dollar (both juvenilles) in a 180 gallon. I don't want to overfeed, but the darn silver dollars steal everything out of the water column before it can hit the bottom. The Geophagus won't come more than a few inches and only want to filter feed, which isn't unexpected. Do I just keep feeding until enough hits the bottom? Do I need to worry much about the silver dollars over eating? I'm eventually going to add a Severum and probably an Oscar, so it's going to be an ongoing problem.