I can't wait either. It's at 77F right now, at 79 he goes in.
I wanted to acclimate both rays at the same time, but I'm impatient!
Edit: Had a dip in temperature in his temp tank that matched the big tank. I did a bigger than normal water changeout and put him (the ray) in the big tank. He was cautious at first, but there are little foot prints all over the place from his pelvic fins. It's hilarious.