Do you mean severum? If so I think size will be the only issue, both of the tank and of the fish. Both are cichlids and will defend thier teratory. But both are more peaceful cichlids and usually will not go looking for a fight. I would say if they are of simmilar size, and in a large enough tank with good hiding spots it should be ok. There is always a chance any individual fish will not get along with another fish, regardless of what thier "average" temperment is, so keep a close eye out the first week or so.