the nigripinnis would need a flight attendent they are well known jumpers plus they get a good size on them about 4 inches and they need company in the form of 5 to 6 if not will be a timid ready to jump fin, they also are a timid fish by nature most aquarist kill them with water changes, the obliq would more than likely beat your juli's up but if you want to try it i guess go ahead and see what happens i would add a trio of neolamp multifasciatus or a trio of neolamp brevis add some shells and that would be sweet but its your call my friend..