I recently added a large frogspawn like coral to my tank... it is not the typical frogspwan as the heads as smaller and more of a lime green vs. green. I noticed that the rock next to it started to bleach (it was full of zoas). today, i just noticed that some of the branches on my purple Stylophora Coral are bleaching as well any idea what causes this? The Stylophora Coral is about a foot away from the frogspawn (if the frogspawn the culpirt). Any suggestions?