what's wrong with my bali tri-color?

Any clue what kind it was? I had 2 acro crabs in my tri colour that didn't harm it but I took em out anyway....off to the sump
 
Any clue what kind it was? I had 2 acro crabs in my tri colour that didn't harm it but I took em out anyway....off to the sump

pic attached...
 

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