Didn't want to hijack a tank journal, but what does it mean when you say something burned corals? Do we see bleaching? Do they turn pale, white, then tissue disappears? Can burning be caused by Alk/Ca dosing when solutions touch the tissue? Can it be caused by light? I might have this going on with some corals in a frag tank. It has cubic orbit LED lighting but is only 12" deep. Also, students hand dose 2-part in front of a circ pump.