OK, after finding out the hard way that danio's are not exactly good room mates, I've removed them, and upped the neon tetras to 10. Everyone is much, MUCH happier. They're all swimming about and being little explorers. The dwarf gourami is enjoying some much needed rest as well. Now the question becomes, what's colourful and friendly and calm that I can add? I would prefer fish that don't need a school. Just singles that mill around and do their thing. Are there many options for that?