Thats exactly what is happening with mine I added the Black Wolf with my Gar a couple months ago, right away the Gar was 12 inch at the time and the short 6 inch Black Wolf stared the Gar down and they faced off. The Wolf actually scared the Gar off and they have coexisted since. My Diplogramma have been swimming right beside and with the wolf of course if I notice too much aggression I will take the Wolf out but I think they will be fine.