so you saying you have separate feeding dishes ? have you tried to mix them all in one cup ? this is the only way I can get some of my chams to eat dubia . they move more when they are in a cup mixed with other feeders or sometimes they get eating by accident .
order the size you need , if you buy small ones you can feed them to grow but its going to smell really bad . then when you ready to feed them off take the food away and let them clear their system (poop) for a couple days then rinse them off .. they produce ammonia when they eat and that's no...
I forgot I had some dubias in a cup for about two weeks and they were all still alive living in calcium powder with no water so they are kinda hard to kill ..
if you don't wanna breed them room temp is fine .make sure you bin is not a clear one and try to keep them in the dark . they can go a long time without eating as well .. add more holes for air flow . as for food they love carrots and oranges oats and many other thing .. you can find a gut load...