I think most fish feel more comfortable when there are live plants in the tank. You should be able to grow some low light plants in a 10G. Just make sure your light is a fluorescent light. Incandescent lights that come with some fish tanks can run very hot, increasing the temp in the tank drastically when you leave them on for extended periods of time. When you have live plants, even low light plants you need to leave the light on for about 12 hours a day. If you want a really easy starter plant I'd go with java fern. You have to attach it to a rock or piece of driftwood. It does well with minimal light. I also have some water wisteria that is growing well in a 10G using the light that came with the tank.