I have an acro that started to STN quite some time ago and stopped about 1/2 up from the base.. Algae was starting to grow on that small section (it stopped stn'ing about a month ago) and it has been annoying me for awhile.. So I finally fragged it away from the dead part.. Needless to say it slimed up from the stress of fragging.. I just watched my Scopus tang and Foxface eat the slime off the coral.. Anyone else seen that or know why?