Emerald crab in frogspawn

I've seen my emeralds do this before, also on my toadstool leather. I dont believe there is any foul play, he may be cleaning the stalk or just hanging out!
 
Just hanging out. My emeralds seem like they enjoy hanging on stuff that doesn't like them. Zoas, Duncans, etc.
I think they enjoy being aggravating.
 
I have 4 emeralds and love them. One spends most of its time in my frogspawn and occasionally ventures out for foraging. Never done any damage. Frogspawn is happy and healthy.
 
I had one that would travel to my goniopora at night and I thought he was eating it. Turns out he was eating algae that had grown inside exposed skeleton. This actually allowed goni to regrow in those previously dead areas. So I say let em do their janitor thing.
 
I had one that would travel to my goniopora at night and I thought he was eating it. Turns out he was eating algae that had grown inside exposed skeleton. This actually allowed goni to regrow in those previously dead areas. So I say let em do their janitor thing.

Cool
 
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