Here is an example. It is of ricordia, not anemones, but close enough. This pic is taken with a black light and a yellow filter over the camera to show only the florressence. The rock had tipped over which resulted in some rics getting bleached. They are the bright spots in the photo.
By the way, black light is a great tool for finding polyps which have bailed out and end up in the dark behind the rockwork. The more bleached they are, the brighter they glow.
<table style="width:auto;"><tr><td><a href="http://picasaweb.google.com/FlightyMail/Bleaching/photo#5006696963026298114"><img src="http://lh5.google.com/image/FlightyMail/RXtcXHs1pQI/AAAAAAAACUs/kE1SzvwQrG4/s288/DSC04313.JPG"></a></td></tr><tr><td style="font-family:arial,sans-serif; font-size:66%; text-align:right">From <a href="http://picasaweb.google.com/FlightyMail/Bleaching">Bleaching</a></td></tr></table>