Would they pick on sharks or eels? Thats a strange question... I don't know about pinkface but I have had a little bit of experiance with melanurus. Unless you have a very small species of eel like a gold dwarf theres a very good chance the eel will eat the melanurus. My snowflake only left a 3" Halichoeres chrysus alone for 4 months before making a meal out of it. I'm pretty certain a shark would eat one too.
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