Hopefully someone else will chime in, but how old is your cham? Are you feeding him the appropriate size? I use cricket crack, lots of wholesome cereal and fresh veggies three times a week. My male panther is a year old today and I give him 5-8 roughly every other day. I don't want him fat, but definitely not skinny either. I love dubia
There are some people on here that have amazing recipes for Roach chow and really know a lot about diet, much more so than myself. Try searching chow or resipe or Roach. Diet and your bound to run into some great info