Hammer Coral receding. Is this a pest?

[MattyFishes]

Hammer Coral is receding. Left branch more than the right. Need help identifying the other critter I can find on it. It’s purple/red. Can’t figure out what else could be wrong.

 

[Baldyreef]

any photos under white light? could be a flatworm
are your parameters in check?
any large swings?

 

[MattyFishes]

No large swings. Parameters are solid. There’s 4 other hammers next to it and they’re all healthy.

 

[MattyFishes]

any photos under white light? could be a flatworm
are your parameters in check?
any large swings?

No large swings. Parameters are solid. There’s 4 other hammers next to it and they’re all healthy.

 

[Baldyreef]

i would try to inspect the base for pests like euphyllia eating flatworms how long has it been receded?

 

[MattyFishes]

i would try to inspect the base for pests like euphyllia eating flatworms how long has it been receded?

About 5 days now. Doesn’t seem to be getting worse. I’ll dip it again and see if that solves anything. Any idea what the red/purple organism on the branch could be?

 

[MattyFishes]

i would try to inspect the base for pests like euphyllia eating flatworms how long has it been receded?

Here’s pictures under white light.

 

[Baldyreef]

Is this part of the fleshband? It’s kind of hard to tell by the angle