Loss of apatite, general lethargy, weight loss wile still eating. There are probably more. The problem is that usually once these symptoms start your cham is in serious trouble. Reptiles do a good job of playing healthy. If you suspect for one minute your known clean cham is infected you should do a fecal asap. If this is a new cham, then one needs to be done any how, just to make sure he is parasite free.