fishhawk,

You are correct, but remember our corals come from a wide range of environments. Some may acclimatized to shallow lagoons where temps are high, but some may be deep water corals where temps are much lower. By keeping temps in the 78-82 F range we are providing an environment that is suitable for most corals.

Some corals are left exposed to the air and equatorial air temps during low tides in many shallow lagoons, but I don't plan on trying that in my tanks.

Gary