If I wanted to add Boseman's Rainbows and Rams to my 75G tank (which will have 4-6 angelfish with a number of smaller tetras and characins, and perhaps cyprinids), what should I take into consideration? I want the smallest possible numbers of these fish, if they're not shoaling/schooling. Could, for example, 2 rainbows be OK? Or do they need to be in larger groups? The same question is for rams. I am thinking about Bolivian Rams (if I could find them). Plus, would they (rainbows and rams, that is) be compatible with angels and other smaller fishes?