6-8 is a good number to start with (CL)
The Bosemanii Rainbows are great fish, but have a lot of yellow/orange in them. Those with the CL will have a lot of the same colors, not at all a bad thing mind you. I would do a half dozen Bosemanii w/half a dozen Emeralds. I am waiting for my LFS to get some smaller Emeralds. Love the look of the blues and greens. I have Dwarf Neon Rainbows, but they don't have the size and colors of their bigger cousins.