Pointless really, whilst the larger species of rainbows may shoal together out of necessity of their own species, they dont tend to with the dwarf of the species. My boes stick together, my lacustris stick together, the trifasciata will shoal with anything strangely, the praecox (dwarfs) stick together. Thats just my observation of course with all of mine, others may have seen different behaviours with theres.