"They won't suffer visibly in a group of 6 (which is why people say it's fine)." I find statements like this rather frustrating, because it seems to imply that, even though the fish appear healthy, active, and unstressed, we know they really are suffering. But really, isn't a fish's appearance and behavior all we have to do on? How do you know they're suffering if they aren't suffering visibly? In my experience, the fish ain't talking, so appearance and behavior are all I have to go on. I don't mean any of that as an attack on you, Ichthys, and I appreciate your insight. But could you clarify what you mean? If they aren't suffering visibly, is there a reason to assume they are suffering invisibly?
Your insight about fish stores is right on the money for most situations, and it made me laugh. In my case though, the guy had already made the sale; we were talking about odessas vs. green barbs, and he was going to actually make less money if I bought the greens. We were just two fish keepers sharing our experiences, and he mentioned that the green barbs seems friendlier and more comfortable in small numbers than most other barbs. So, there's no need to judge his motives. He was just sharing an observation, and I was wondering if others had observed the same thing.
I bet a school of sixteen looks absolutely amazing. Are they a lot more active in a bigger group? Seems like a 29 gallon would be pretty cramped.