IMO they are not good in a reef tank, they are like crowbars swiming through your rock, if your rock work and corals are not 100% solid and unmovable they'll knock it all over. Less of a concern is the waste, they eat a lot and poop huge turds. Ive had a few eels and have tried in a reef a couple times. That being said if you cement your rock work together, dont mind a few broken corals and have a killer skimmer go for it.
A great alternative to a snowflake would be a dwarf golden/yellow eel, they are very chill, much smaller and very cool. Oh ya as with any eel you have to make sure the tank is escape proof, they are escape artists.
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