What dos my coral have?

[Superlightman]

Hello,
Have someone and idea what this coral have? I have it since two weeks. First he was OK polypes big open, but now he is close and have some brown things? Water parameters are OK and other corals also.

 

[nex64]

Pics very blurry but looks like you got some sort of algae growth on the coral itself which is usually no bueno.

 

[C. Eymann]

When someone posts water parameters "okay" in some cases something is off, what fsh do you have? IMO it kin of looks like something is chewing it up or you may have some slk burn going on.