One of my female convicts has a strange lump on her belly... I think its coming out of her butt. Looks like a bubble or something. It has doubled in size in 24 hrs. I read something about swollen anal glands?? WTF? These fish are so new to me and I don't really know much about them. Should I be concerned about this strange lump? I have a friend with a few convicts and she said two of hers have what she calls "outies" as well.... is this just a normal thing that happens to fish?