Temperature affecting salinity? Oh, sorry I was assuming you had some kind of auto top off (which would mean your salinity doesn't change with temperature).
Leathers are gonna be fairly hardy, I would think. But SPS tend to be rather sensitive. That said, I think as long as the temperature swings are slow enough they should be able to handle a little bit of warm. As to what exactly would be beyond "warm" though is a little tougher to call. I've lost acros when heat spiked to mid 80's, and I've also had no losses after hitting nearly 90. The difference, if I was to guess, is probably in how fast the temp comes up (and back down again).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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