I had a lone julii cory in my tank for the last few weeks. I was waiting to find some more juliis, but finally purchased a couple melini cats instead. My julii went beserk. He immediately grazed one of the melini's body all over with his barbels, and started fluttering and dancing around him, following him all over the tank as the new guy explored. Even now, the little julii is huddled beside one of the big melinis, quivering like an excited kitten. Makes me feel terrible if the little cory has been that lonely all this time . . . .