One thing however is with the high temps in the tank, can cause huge fluctuations in salinity and PH in your tank. So naturally, with the high temps in the tank, the higher the evaporation rate=huge water parameter swings.
This is where I have read in many forums and books that stable temps are very key to a reef tank, they are closed environments. Of course, what works for me doesn't work for everyone and I freak out if my tank temp ever gets above 78. I am purchasing a chiller myself for a tank I bought from Dennis and because it is bigger, it will be harder to maintain a stable temp. Quality products I believe are paramount to this hobby. This is why I am building this tank slowly, because with quality products, comes higher prices if I can't find them on ebay or craigs list. LOL!
Thanks!