Pulsing Xenia is shrinking/dying?

[jonleeroyix]

Over the past couple days my Xenia has gotten smaller, no changes in params, only thing is I added some SPS which horribly failed and almost all died but one (rip bank account) but anyways, didn’t put any of them near the Xenia, I have a leather right by it but they don’t touch, any ideas? All other corals previously in the tank are thriving the second picture is from todsy and the first is from like October, it’s since gotten bigger but I didn’t have anymore recent pictures

 

[dvgyfresh]

What ar me yr nitrate / phos? Xenia like it dirty a bit