Who’s eating my coral the emerald crab or flame angel?

[Frizzy reefnewb]

I have a coral I love but idk the actual culprit I’ll post a picture below but my flame angel does “nip” at it but it doesn’t seem to really mess with it ...I then have a emerald crab that is kinda big and definitely comes out at night ( these are both just introduced) is this coral dying ?! As I would hope not because I’ve had it for a long time ...kinda stupid question but was jw maybe it’s not even dying but I never seen white marks on it looks like dead coral just white

 

[fishguy242]

hi, seems to have nice growth edges,kinda doubt flame ,crab possible, are we just looking at spot in center?
would blow off with baster,keep clean,watch for progression.

 

[Frizzy reefnewb]

hi, seems to have nice growth edges,kinda doubt flame ,crab possible, are we just looking at spot in center?
would blow off with baster,keep clean,watch for progression.

Thanks for the response yes the spot in the center I Dk if you can see that but by the white there’s a line almost if you would call it that used to be coral also on the opposite side it’s almost turning dark I’ve had it for years so I doubt water is the issue but I have noticed it being irritated

 

[Frizzy reefnewb]

hi, seems to have nice growth edges,kinda doubt flame ,crab possible, are we just looking at spot in center?
would blow off with baster,keep clean,watch for progression.

Will blow off with a blaster today ty!

 

[fishguy242]

hi, be sure to come back here ,if it seems to worsen,we can call in some expert help...

 

[176327]

Crab lives matter... but it’s probably the crab.