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I would guess an american eel would snack on them 24/7!! Do u have one? And where did u get it? Those things get like 8ft (at least in the wild) and are probably about as thick as your thigh as an adult. (This is if this is a true American eel)
The eel will eat anything it can get its mouth on. Not a good fish for a community tank. You really have to do your homework before you buy something you aren't familiar with. Don't rely on the seller for your information.