Yesterday I cleaned out my African dwarf frog tank. This morning I noticed one of two of my frogs was stuck on his back, after helping him to flip back over I noticed his leg was white and swollen looking (it almost looked like skin was shedding off and had got stuck, but I do not think this was the case). He also looks bloated now. The other frog appears to be fine. The tank has a heater and a filter, and like mentioned above was just cleaned yesterday. Pleasee if you can provide any information on what I should do with my four year old frog, it would be much appreciated.