Chalice has lost pigmentation

[MiZuboov]

Hi!
What do you think could be the reason? I installed Radion 3 weeks ago, maybe that's the reason? Or is it more like hydrochemistry?
Thanks a lot!

 

[Js.Aqua.Project]

If it is only losing color in that one spot I am going to assume irritation/stinging from a nearby coral.

 

[MiZuboov]

If it is only losing color in that one spot I am going to assume irritation/stinging from a nearby coral.

A week and a half ago, there was a black dot on the other side, now it has tightened. Can there be no other reasons?

 

[Js.Aqua.Project]

A week and a half ago, there was a black dot on the other side, now it has tightened. Can there be no other reasons?

In your photo it looks more flesh recession is occurring. Usually if that is only happening in one spot that is a sign of something stinging or otherwise irritating the coral.

Lighting and nutrients can impact coloration but usually that will be seen across larger swaths of the colony.

 

[MiZuboov]

In your photo it looks more flesh recession is occurring. Usually if that is only happening in one spot that is a sign of something stinging or otherwise irritating the coral.

Lighting and nutrients can impact coloration but usually that will be seen across larger swaths of the colony.

No one stinging coral I keep near that chalice..Palythoa can do it?

 

[Js.Aqua.Project]

No one stinging coral I keep near that chalice..Palythoa can do it?

It is possible that the Palys are either touching it or otherwise irritating it.