I have two answers for you. I find tanks are easier to maintain at 78F as everything progresses slower (including growth of corals, but also growth of algae). The corals grow faster at 82F which, depending who's article you read, is close to natural reef temperatures where typical SPS and shallower water LPS are collected. Everything progresses faster at 82F though, including algae growth, breakdown down nutrients, etc. so you have to be more on top of things.
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~ Mindy
SPS fanatic.
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