My big girl is not feeling well. She is 5 years old and i have kept her and her 2 male friends in a 33 gal live exo vivarium. There have been no changes and everyone has been healthy. the boys usually sleep all day and are not too active. She is usually awake starring out and jumping against the glass if anyone gets close to try for food. About a year ago i switched from crix to dubias . For the last couple of weeks she is not herself. she s still fat but does not want to eat and spends her time soaking. her eyes are not as bright and she turns away if i try to feed her. very unusal for her. she has a bump on her back that is the size of a nickel that looks fluid filled. Any ideas on what could be wrong?