I have had a snowflake eel in my 60 gallon for quite some time, of course in about 2-3 years he will grow rather large, sometimes as big as 32 inches. But it will take some time, also only feed him 2-3 times a week, it keeps them happy and it may help slow down his growth somewhat. All and all they are a great addition, strong, good eaters, and mine is suprisingly active, spends half the time in the rock and the other half swimming about. He's rather peacful, just make sure you dont have any fish that he can eat.