Well I had a frag that was growing well. I cut 2 frags off to continue the chain.
One frag RTN'd a few day later. o
The other frag was healing and it too RTN'd a few week later.
Just the other day I suddenly saw my main piece start to RTN and I cut a few branches off to see if I could save them, but to no avail. It all RTN'd the next day. Dang ,it was doing great for almost a year. I can't figure out what caused the RTN. All my other SPS are fine.
Seems like this coral is very sensitive to changes in parameters. The only thing I can see is a spike in Alk that might have caused it.