Personally 85-90 F is ideal with a gentle breeze coming off the ocean and the water temp of about 80... that sounds like a partial cure going out daily to do a little snorkling, I do not think I am up to diving anymore... think the tanks would kill me!!! than again in a good shallow reef, nature abounds enough to make up for it. I love it when the old whites are running, may be cruel, but like to toss some fries in the water near my wife and they swarm around her... watching the clown fish and seargent fish with there brilliant colors just swimming lazily about and the occasional ray almost gliding along in the current and now and again allowing you to rub them, their flesh feels almost like soft velvet. Than afterwards going into the pool and swim up to a stool and partake in a frozen drink... now what was the question