Cabbage leather pathcy

[blizariondds]

 

[blizariondds]

So sorry the mobile post messed me up. Anyway, I’ve had this coral for 1.5 years. I noticed the light patchy areas very recently. Phosphate and nitrates are very low but always have been. Light settings are the same. Dkh is 8.6 Cal 484 Mg 1258- monitored by apex. Have not changed its position. Only other unusual thing I’ve noticed is one of my large green mushrooms hid in a cave. Any advice? Thanks