how to stop rtn?

[Nano]

Originally Posted by FragIt Dan

RTN is caused by some sort of stress to the coral... figure out what that stress is and how to fix it and it should stop on it's own. Sometimes just the move and change in water can start the RTN. trimming or crazy glue might isolate the dead tissue, but if the stressor remains it will just kill the remainder of the coral. What else can you tell us about what might be stressing it out?
Dan

Well the only thing I can think of is it was on the sandben in the tank I got it from, I put it mid level in my tank, the tank I got it from was metal halide, mine is led other then that my parameters are fine
Salinity 1.024
Ca420
Mag1350
Alk9
0 nitrates ammonia etc. I clipped off the rtn area and fragged a piece that looked good, then glued over the affect cutting site I hope this works.. I also move it back to the sandbed at the front of the tank, whch was where it was in the tank purchased from.