I have had my Senegal bicher for about three months. It's about 5 inches long. When I got home from work today I noticed that it had a noticeable lump on his underside right behind where I believe his stomach is on the left side. It's fairly small, there is no discoloration or anything else. Does anybody know what this is? He eats pellets and I recently stopped feeding him feeder guppies because I was told it is a bad idea and can introduce parasites. Thanks.