It really depends on how you go about it. They may or may not get along. If you have a sparsley decorated 29 gallon with a school of full grown boesmani rainbows swimming about and you start plunking in small neons then they will probably look at them as food. On the other hand, if you set the tank up with some plants and decorations and have a well established school of healthy neons swimming about you could probably put in some young rainbow fish and have them mature out with very little problems. It is all about how you go about it. On the other hand yet, just remember, the fish have not read any textbooks and while there are guidelines to follow, you can always have just about anything happen in a tank. Which means, 6 people could come in and say they did great. And then you could have a disaster. Vice versa. Bill