Okay so 3 days ago I bought a baby girl veiltail from petco to add to my 10 gallon community tank with 2 guppies and 2 ghost shrimp. When I got her she was white with pastel purple and a pastel pink tail, and 2 days after her tail had turned almost red and she gained a lot of color so I thought she was doing good. However when I woke up this morning she didn't eat anything and I noticed a sphere like lump on her underside. I tried to do some research on it but I couldn't find anything! I'll post some pictures below so everyone can see. Please help I'm super worried about her!