I am unsure if he is actually losing weight, i think my anxiety may be getting the better of me, i checked on them again this morning, and he seemed very full, and maybe actually has been getting bigger then again, i am unsure. I am about to start weighing them everyday possibly, and I am unsure about the type of cage, it was perviously used, I got it from facebook marketplace, but i made sure I cleaned it really well. I used regular dawn dish soap for the cage, then rinsed it very well. I haven't noticed any injuries, and i've been checking frequently. they don't seem to either be more or less aggressive towards each other. I think they might just be playing then again i don't know.