IMO its not the swing, its how slowly the temperature raises and cools during the day. A very fast swing doesn't allow the corals to acclimate gradually to changes while a slower swing, they almost don't know its happening. I did have my tank swing from about 78 to 92 a few days a couple of summers ago (pre chiller) without any side affects. However this does not mean that your tank is safe or you won't experience a problem. A swing of 3-4 degrees seems to be normal for most tanks.
__________________
Christy's Reef Blog
My 180 Build
Every electronic component is shipped with smoke stored deep inside.... only a real genius can find a way to set it free.
|