Im looking for an eel to put in a 55 gallon tank. I have it narrowed down to either a zig zag eel or a peacock eel. Does anyone have any info on zig zag eels? The website i went to was very breif in their description. I need info on what kind of tank-mates are good, their special needs, how large they get... I want to know everything. What exactally is a fine or sandy substrate? Will angelfish get along with any eels that will fit in a 55 gal?