I have a red eared slider who I've had for the last 25 years (So he's about 27 years old). His top shell is about 8" and his bottom shell is about 7".
His tank (48" x 18" x 21") which I've had for the past 12 years, just started to leak.
I know I could repair the leak, but I am wondering if I'd be better off getting him a new tank instead. Should I be getting him a larger size, and if so, what size is best? Wider/taller?