Of course! And thank you. STN and RTN are slow and rapid tissue necrosis brought upon by an infection of some sort. Typically this is how euphyillia kick the bucket. Again it is likely an alk problem. You need to see what your current level is at and also see what the swing is at night. When the lights turn off and photosynthesis stops, it can cause a drastic alk drop which has horrible effects on some corals especially when one doesn’t have a wave maker breaking surface or a fuge on a reverse schedule, and even worse if your not checking alk and doing constant water changes or dosing. Im guessing this is actually what is causing the slow demise.Again this morning the torch is half out so I’m thinking it doesn’t like the light intensity. I’m going to reduce the settings as I’m running AI Prime HD and see if it likes it.
Edit - it won’t let me attach the video..
I also run AI primes. I can send you a screen shot of my schedule if you like. Your light levels do look a bit high. Where is your white percentage at? Maybe try lowering everything 1/4 and see how the results are