I purchased this a year or so ago and it seemed to do well for a while but slowly I've noticed the edges turning a grey color. I can't find anything this color so I'm not sure what it really is. Any help with classification or care is much appreciated. I was told once that b/c of the lighter color it didn't like strong light, but I'm not sure how true that is. Most favia I have read about are found in shallower water?



