at menards they only have 12/12 size tile is that to small? my bearded dragon is 7months and i dont want to dwarf him with a wrong size tile i had a couple things in this tank but he was going to the size of the items and not out growing it so his tank is blank now till he hits a year ill decorate it he is in a pvc tank double stacked cage i only need 2 tiles for both cages i have 42L 21W 15H thats the size of my tanks