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Ive had some bleaching too but I dont think it has to do with my PC's(192W on a 40gal). They seem to be sensitive to higher temps. Normally I keep the tank at 77. This summer we had a heat wave here in seattle. The tank hit 81.3 one day while I was gone at work. A small bleaching episode followed in about 5-10% of the tbs coorals. When I altered the flow in my tank the other day by changing my PH angle slightly and adding another pump, another one of my tbs corals started to bleach. They seem to recover with time and good feeding. One of mine in particular has bleached twice now, but keeps coming back. This TBS coral is on a rock that is dense like a brick, so I imagine that the rock held in the heat for longer then the water did, thus exacerbating that corals bleaching problems during high temp episodes.
Looks like ill be hunting polyclad tonight!...
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