I have a 120 gallon reef with three lemon damsels, two yellow tail damsels, a royal gramma, an ocellaris clownfish, and a tomini tang. The damsels are all rather easy going and only bicker mildly with each other - mostly some harmless posturing. I'm looking to add additional small fish that will coexist peacefully with each other and the tank's current residents. Any ideas for fish that can be kept in groups? I'm going for slice of that typical coral reef documentary scene in which numerous small, colorful fish hover above coral bommies.