I recently got 4 new glass catfish! Previously, the store only got one, but it was actually doing fine and eating well. It was also active at feeding time and at night, but after the introduction of more catfish it started to hide a lot in the back and now it's not coming up to the surface to eat. I'm assuming that it is in the back so it can school with the other fish, so is there a way to tempt them out to at least eat at the surface? I can barely see them most of the time now and because I need to use a pipette to feed them the other fish are getting overfed.