Snowflake eels fall into the "pebble toothed" eel category. as opposed to the fang toothed piscivorous eels. pebble tooths like the snowflake specialize in crustaceans. not so much in fish; however if they get hungry enough, and that fish can fit into the eel's mouth, then it would be in some danger. Keep the eel well fed (well fed, not over fed) and the fish should probably be fine. How big is the eel? if the eel is small the fish might be in no danger either way.
you can't call your tank a non-predator tank anymore. the eel is a predator.
I hope this teaches you two vital lessons. no impulse buys and dont trust people looking to sell you something too much. do your own research properly!
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