<a href=showthread.php?s=&postid=12287663#post12287663 target=_blank>Originally posted</a> by LukFox
For how long? A snowflake isn't going to last long in there. They get 3 feet long- way too big for a 40g even if kept alone.
The only eels long term that can be kept together in a 40g are the dwarf and chestnut morays. The dwarf gets 12", and the chestnut gets 14". Good choices for a small tank.