Hey guys!

My hog's tank temp is 90 degrees on the warm spot, but it is as low as 65 degrees on the cool side. I know they are okay in a wide range of temps, but is 65 too low? Should I go ahead and buy a bigger UTH? He is hanging out on his warm side & now that he's settled in he's not cold when I pick him up.

What do you think? Leave it alone, he's fine, or step up the heat with a larger UTH? I can't put a heat lamp on top because it's an acryllic tank. No screen.