I think in view of whats been posted and bandied about on the Big Boards, 80 F is a pretty good safe compromise. Thats what I strive for in my soft coral tank. Without central heating though it can drop to 79 in winter and with the fans and the amount ao evaporation possible with a 75g tank and 55g sump 82 or less in the hottest part of summer is about max, though I have had smaller systems go higher for short periods of time
I really would say that it depends on what you want in your tank... my 75gal is set as a sps tank... temps get about 74 at night, and raise to 80 durring the day. some studdies have shown that the cooler temps give you better color, while higher temps give faster growth. I really used to be a staunch no-temp-flux beliver, but through reading, and seeing Horge post some on the actual temps of natural reefs, dont worry as much. all my fish are fine, and the corals look great.
78. I have softcorals, hermits, snails, and clowns.
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