we picked up 2 beardies from petsmart 15 months ago. they have barely grown.. they eat like champs. meal worms and crix. i dont understand why they wont grow.. husbandry is spot on in a 30 gal tank

I seen a guy with a one year old and his was 5x bigger than ours..(he got his from the expo we were at) his girlfriends was the same age and was the same size as ours (she also got hers from petsmart)

what is going on and does anyone else have the growing problems.. thank you