Hey guys, I need some advice. I recently purchased a 40 gallon breeder tank (36x18x16) and I am trying to decide between two cobra heat mats. I'm not sure if the 11x11 30-40g model will provide enough heat for a nice gradient. Should I go with the smaller 11x11 mat or the next size up, which is 11x17? Thanks.
p.s. thanks for looking, heres a picture of one of my geckos.





