I have a 30 g. tank. It's a rectangle one with glass. I'm ready to add more fish. I currently have 4 Gourami's, 5 Zebra Danio's and 2 pictus catfish. I'd like to add neon tetras maybe.... Kind of like the angelfish too. Don't want livebearers. I want a little bit of color in my tank if I could. Also, any good websites to research some more about this. This is my first tank, so I want to make sure this is done right. It's been cycled and water parameters are all good. pH 7.0 and ammonia/nitrites are good. Ideas please!!