I've found that duboisi are mostly agresive to each other...never had a problem with them and any other fish...I say add them! If it doesn't work out for you, then pull them.
Hello all I am freshmikes cousin from Saskatoon. I like fish...kinda smell like fish. Looked at some fish this one time...It was pretty cool. Anyway thought I'd say hi and introduce myself. Happy fish having!