Neon Tetra Social behavior, please help. 10 points to best answer?

I wouldn't worry about it :) it seems like you know what you are doing. Neon Tetras will school for safety right? Well if their is nothing to be safe from whats the need? It seems that your Neon's have become bold, they aren't as scared. I own a school of 12, they venture off often, like they would split into groups, go solo, or just stick together. The one that's all alone is probably just a bold individual. If hes eating properly, hes probably not sick or injured.If you want more schooling action add more. The more the merrier! Good luck!