Snowflake I would think you could get away with, they like to hide anyways, but your looking at about a 24'' eel in aquaria, the biggest it could get would be around 28''. Another smaller one is the ribbon eel, that is one of my more favorite kinds, but I have looked up info that says they can reach 32'' and can be finicky eaters in captivity. Those are the two kinds that my sw store here carrys that are "smaller".
Ribbon eel of course is the more colorful and cooler one in my opinion.
Hope I helped ya out a little bit.