Sick xenia

[missmure]

I know most people consider these a pest but i love mine. it was big and pink but has shriveled up and turned a greyish color its the only coral in my tank to do this. My parameters are Nitrite - 0.2, Nitrate - 20, No ammonia and my my ph is steady 8.3, i dont have test for anything else it is under an Ai light and in moderate flow what should i do?

Before

now

 

[Reefing4L]

you found a way to kill them without nuking your tank? Time to sell it as a xenia outbreak remedy