Hammer coral closing help

[coastalnanoreef]

So I have a tank filled with hammers. A couple months ago one of my hammers looked really weird and closed up but was still open a little bit. It has stayed like that for roughly 2 months. Now a second hammers is doing it and a third looks like it might start soon. Any help would be greatly appreciated. It happened to the green and purple first. Then the purple. Now my yellow is looking like it might close. But I have 10 other hammers that are completely fine.

 

[MnFish1]

1. any new additions (parasite/disease possibility)
2. Any possibility of stinging from neighbors
3. Any other changes? What are your parameters, lights, temp, etc?

 

[coastalnanoreef]

1. Possibly but I don’t see anything on the corals.
2. I don’t think so because they were fine for 5+ months prior to this.
3. No other changes at all. This has been a thing for a couple months. If anything I think it’s a parasite but I was trying to see if they would go back to normal. Now I’m seeing if anyone has had this happen to them before.

 

[maleks.reef]

I am pretty sure im experiencing the exact same issue with my hammer and torch!! Check out the pics I posted here https://www.reef2reef.com/threads/euphillia-not-doing-well-help-please.828061/

 

[dmy535]

You know the drill, list out your water parameters