my danios dont school at all! thay chase each other round the tank like madmen and do little dances to each other, but as far as schooling goes, i dont think they do much. i agree about the glowlights though. when i first got them all six hung out together and they still do when they get a bit stressed, like after a water change, but when they are relaxed, they tend to be in two's or three's and the braver one goes off on her own. i love both types of fish, and the danios are brilliant if you like really active fish.