Well, it's probably one of those "maybe" things I would guess.... Several people on RAMR keep morays with cleaner shrimp - you've seen pics I'm sure of morays in the ocean with cleaners inside their mouth and gills? Or take a look in Scott Michaels book, and see how many eels have cleaners hanging about !
I think it might depend on the size relationship and how hungry the thing happens to be too.
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