Hmm the only one that sounds right to me is bad water condition but whats considered bad? All corals, fish are doing well. And my rbta was not bleached to begin with until I added ICH ATTACk thats when it started to bleach. I did a 10% water change and ran carbon afterwards. And continues with bi-weekly water changes. The rbta bleaching isn't getting worst nor is it getting any better. It still eats, has not moved. So I am puzzled.....