A group as in how many? it would probally be better keeping the pleuro in a group, however i have one of each and they both stick together like glue,you will like them both, i love the pleuro for his bulshi attitude and the parachanna obscura for they way he sneaks up on stuff and trys to act like a peice of wood, and how it looks like a true snake with little wiggling worms on its snout....is this to house with the micro's?be careful as i beleive micro's will get aggressive with age,