Wow, mine doesn't even come close to 20 a day. Maybe 8 at best and he is a tad over 6 inches now. He is growing well too. I feed him small crickets. I also, feed him super worms, butter worms and a salad every day. His consumption slowed even further on crickets when he started liking the collards, squash and the many other recommended veggies.
I am kind of concerned now that he is not eating as many as he should but he seems very healthy and happy.