Weird thing in green slimer

qhduong

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Anyone know what this is? Found it on my green slimer today. Yesterday I saw my hermit crab at this exact spot eating something.
20210820_173514.jpg
20210820_173524.jpg
 

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Looks like discoloration of the coral. Could be a self defense mechanism against the hermit crab I’ve had one do that before. On a side note what type of hermit crab?
 
What might have happened is the crab might have taken a couple chunks out of it mistaken it for algae. I’ve seen this before just keep an eye on it if it gets worse lower your lighting a little.
 

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