Ive thought about the ice pack idea, but have also read its a bad idea cus its not consistent. But your right, tide pool creatuers are used to drastic temp changes. Im sure it would have to be fairly regular. If my temp gets above 75 I will definately have to do something about it.
Eventually Im hopeing for an array of stuff in there. Feather dusters, anenomes, gobies and shrimp! There are so many possibilities!
-Diana