I've read a bunch of stories of eels escaping, and have my tank completely covered should my zebra eel be dumb enough to try! The snowflake i had only cruised around middle and bottom of tank. Scubasteve has a funny story about his!
hehehe yep mine made way into overflow box was a 3" standpipe away from a ride to the sump but my tank is full open top with strong surface current and not a single jumper yet ( fingers crossed ) has been a year and a bit ao am over it just my tang from jeff splashes when hungry lol good thing leds arent too close..... and ya copper is bad for eels