my neons and cardinals school together all of the time. Occasionally a neon will stray away from the group. I have two honey gourami in the tank with them that may be enough of a "stressor or threat" to keep them together.
So Jeffrey what you're saying in my case for example, I have a 72G bow with several 6" discus.....the neons feel comfortable, not threatened and the tank is long enough that they know where the others are...so they don't feel the need to school? The rummynoses though are totally different. I know they're not intimidated by the discus in the least, but they sure love to "follow the leader"!
@tjg2007
"Right now the 6 neons are in with 5 guppies, 5 painted platies, and 2 goldfish (I know they are coldwater in with the more tropical types but they like it)."
Well goldfish need cold water because cold water holds a much higher level of dissolved oxygen then warm water does. So even if your goldfish kept in warm water seem to you, in your subjective opinion, to be "happy", objectively their bodies are working much harder to get the same amount of oxygen as those kept in cold water. That is just a fact.
If you want your goldfish to live long, healthy lives don't keep them in tropical tanks.
Given that this is the "Freshwater Newbie" forum, ease up on the turbo. The "subjective opinion" line is a little too sarcastic to be constructive.