One of my dwarf gourami has suddenly got excessively fat. There is no problem with any of my other fish and Im putting it down to his greed at feeding time. He can be a real bully and just doesnt stop eating. Anyway I dont have a hospital tank so Im not feeding them for a couple of days to try and help. Is there anything else I can do? At the moment I feed just a diet of flakes and pellets but am wondering if maybe some veg or worm might help him.