Hey guys! I thought I post about my experience this week dealing with RTN. I had RTN on many a acro over time. Tried all sort of things and none of them really worked short of fragging healthy parts away from the colony. So recently I bought a few new acros. I have my iodide at .06 and everyone is doing quite well ( 90 percent of my acros die if I don't keep my iodide levels up at .06). So this beautiful millepora goes in the tank along with all his acro friends. About 2 weeks later he starts to RTN on me. Yeah this ain't good for any of them. Usually they all go in a row since they are all small frags. So this time I decided to try something experimental. I frag the healthy parts, from the looks of it he was gonna go in one day so no time to spare. I took the rtn'n parts and had them exposed to direct sunlight at around 2pm . I exposed him for around maybe 30 seconds in direct sunlight, making sure he had the sun hit him everywhere. I then put him back in the tank sideways on top of my blade caulerpa about one inch below the water level. Well I am happy to report the RTN has completely stopped and has already started to fill in tissue in the areas he had RTN . Of course since he is lying sideways the area not getting light has died off. But now it has been about a week and he is recovering nicely. Today i am even getting some nice polyp extension. I have never had a acro recover from RTN so this is a first for me. Thought I let you guys know my experience with this experimental treatment. I am not sure if its the direct sunlight, or the lying him down sideways, or the fact that he is lying on top of so much algae. Point being his RTN stopped and has reversed to good growth and moderate polyp extension in one week :beer:.