I have a Snowflake Eel that I've had for roughly 6-7 years and i adore him/her!! He/she is quite visible in my tank, especially when it's hungry it will emerge almost entirely from it's cave to look for food. I've never (knock on wood) had a problem with it, although it has jumped from my tank a couple of times. It's a beautiful eel, very hardy, and probably the easiest eel to keep. The only other fish I have in that tank with it is a Clark Clownfish, then I have tons of reef hermits, snails, Coral Banded Shrimp, Yellow Brittle Serpent Star, and many corals.
I highly recommend the Snowflake Eel, you will not be disappointed