I was looking around I really wanted a spiny mantis or chemeleon(which would actually go into my spare 35 gallon)
Chemeleon cannot be kept in a tank. You should do a lot of research before getting one. They have a lot of special needs. I don't actually have one but I adore them and hope to one day have one.

what about a day gecko? They are so pretty. My husband had one a long time ago, before I met him. I know they do need a calcium supplement, but I'm not sure what else.