What is the advantages to a "schooling" fish? Is it just that they stick around together? I have 2 scooters, 2 domino damsels, 2 chromis, 2 blue damsels, and 2 clowns, 2 engineering gobies and a Foxface/Sailfin Tang. I have noticed all of them seem to stick with each other. If you get more than 2 do they behave differently?