I can't comment on your particular fish choices, but my reef tank been running at 68-71 degrees for over a year now. Originally, it was because of my seahorse, but everyone seems to do fine in those temps. Some of the corals looked a bit mad when the tank was only 66 degrees, but that was a fluke. I have red/copper stripe cardinals, a spotted mandarin pair, a black cap gramma, coral beauty, Lubbock's wrasse, citron goby... nothing too delicate, but all the fish are doing well.