For comparison:
For some local ocean critters i have a tank in my basement. Its temp is 60 degrees. I have recently noticed kenya trees, finger leather and mushrooms sprouting up from the live rock i put in there. the amazing part is this tank only has 20w of 50/50 pc lighting on a 18" tank. all "corals" are on the bottom.
(the live rock came from my 80 degree reef tank and thats where the hitchhiking corals came from.)
I think the most important part is no temp drops quick, and plenty of oxygen.