Maika'i,
Nobody said anything about overall increase in global temperature and coral reef death. Indeed, there is plenty of data that supports the theory that rising (overall) temperatures do contribute to coral disease and death.
1
Rather what
Peter Eichler, myself and many other members are saying is that temperature fluctuation is a natural occurrence on a reef. Moreover, a tank temperature in the 80's is not uncommon for a natural reef either. This is evidenced by data showing that water temperatures near various reefs will reach as high as 87 degrees.
2
Now, getting back to the original situation, as posted, has there been any change in the behavior/health of the clownfish?
1.
Thermal Stress and Coral Cover as Drivers of Coral Disease Outbreaks.
Bruno JF, et al.
http://biology.plosjournals.org/perl...o.0050124&ct=1
2.
http://www.nodc.noaa.gov/dsdt/cwtg/satl.html