He will in time they grow relatively slowly and as long as he is eating he will be fine. To get a faster growth you can always alternate CGD with bugs considering your enclosure I would recommend Dubias and have them in a 4 inch ceramic bowl so they remain contained......he will figure it out, that is what I do with mine...you could feed cricket but I would recommend feeding in a tub because the last thing you want is have cricket not being eaten and still in the enclosure.