I had a small tank get down to 68 for at least two days while I was away and I only lost a colony of green clove polyps. No SPS were lost and I had maybe 10 SPS species in there. I was indeed surprised that everything survived. However, if you think about it, reefs in the upper Florida Keys sometimes get down in the upper 60's in the winter, so I guess its not that big of a deal.
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Rich
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