Should be fine, I had both species in the same tank and they were fine, although it was a 2m tank, I think I had about 4 or 5 of each. If you want to research them a bit more their scientific name is Neopomacentrus azysron. Stunning fish, very active and always swimming in the water column, they like to sleep in the rocks at night so make sure you have enough small caves/holes for them.