Post
by DevilNDisguise » Fri Feb 28, 2020 2:01 pm
Definitely on the side! You don't need to heat the substrate, but you do need to heat the air. With how much depth their substrate needs to be, a UTH placed underneath won't provide that needed heat.
It can also be dangerous to the crabs if placed underneath, since it has the potential to create hot spots.
1 Bearded Dragon, 1 Guinea Pig, 1 Mouse, 1 Lovebird, 1 Dog, 2 Cats, 2 Rabbits, 2 Frogs, 2 Cockatiels, 2 Budgies & Their 3 Babies, 3 Rats, 4 Hamsters, and Many Hermit Crabs!