Can after feeding as long as it goes down. Would be careful as I see all the gravel in ur tank. Keep watching the bulge.Quick question is it normal for them to have a bulge on their left side after a feeding. He ate a pellet or 2 earlier today. But his stomachs a bit bulged should I keep an eye on him or not worry to much he is able to stay at the bottom so I'm not worried about trapped air