I have 2 cresties, both the same age and husbandry. one seems to be falling behind, the male, and i wonder if i should put him in a smaller or larger tub? we moved him to a warmer shelf in our reptile room....i am also considering hand-feeding and maybe assist-feeding some bugs to get him used to them. (none of my geckos really care for bugs). any suggestions welcomed - thank you!