i would just pick the fish you want to keep that are available to you. i would try to keep them as diverse as possible to avoid cross breeding. but even then theres no guarantee its going to work out. theres no definitive guidelines as to what will work and what wont. every set up is different, what works for one person wont for another. research, opinions, and experiences of others are helpful, but in the end you just have to take the plunge and see what happens. i personally like the pure strain saulosi species much better than the coral reds, but thats just me.