Need an ID assist on this...

I've posted these on another forum hoping for help... Will take the help where I can get it... :)

My chromis and I thank you in advance.
 
Did this appear over night? If so I would check for crabs. I had a emerald crab do this to my angel years ago. he just kept pulling chucks off the fish at night while it tried to sleep.
 
Other than the other two chromis subduing the two smaller ones... No one is really agressive... Only other fish are two black perculas. I do have 4 dwarf emerald hermits... Could they be the culprit?
 
@PK wrote:
Did this appear over night? If so I would check for crabs. I had a emerald crab do this to my angel years ago. he just kept pulling chucks off the fish at night while it tried to sleep. said:
slow progression...
 
@opus18 wrote:
[I]@PK wrote:[/I][quote="Did this appear over night? If so I would check for crabs. I had a emerald crab do this to my angel years ago. he just kept pulling chucks off the fish at night while it tried to sleep. said:
slow progression..."]

How slow? If it started out as a sore spot and grew into what is in your pics it could be an infection of some sort. I have never seen a fish attack another in such a precise manner. There will usually be some sort of damaged tissue showing or scales missing around the area but in your pics it looks like a very precise and "clean" chunk missing. I could be off base here so I will let the Pros in identifying those things chime in.
 
@PK wrote:
How slow? If it started out as a sore spot and grew into what is in your pics it could be an infection of some sort. I have never seen a fish attack another in such a precise manner. There will usually be some sort of damaged tissue showing or scales missing around the area but in your pics it looks like a very precise and "clean" chunk missing. I could be off base here so I will let the Pros in identifying those things chime in. said:
Its something that has been becoming more and more noticable over about 3-4 weeks...
 
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