Bleaching?

[BlackPanther]

Hello reefers,

Two days ago I observed milka coral as shown in the photo, a big area turned to white, however my tank temperature was stable 26.5c , Any idea of what’s happening ?

 

[andrewey]

Could be RTN or STN. If it's continuing to spread, I would suggest fragging up the colony. Unfortunately, RTN/STN is poorly understood and can be related to nutrition, lighting, flow, water chemistry, or no real change (can happen to stable tanks after years of great growth without any changes).

 

[BlackPanther]

Could be RTN or STN. If it's continuing to spread, I would suggest fragging up the colony. Unfortunately, RTN/STN is poorly understood and can be related to nutrition, lighting, flow, water chemistry, or no real change (can happen to stable tanks after years of great growth without any changes).

Thank you so much for your support. It was spreading actually, I fragged it.