I don't have a light on my tank since it's a kritter keeper, but I heard that you can raise Java Fern in low light. The only light comes from when I leave my lamp on and some light (not much) getting in throgh the windows. Can I add Java fern to my tank or would that be a problem? Also, what else would be a problem? I have a filter and a 2.5 gallon tank with low lighting, 1 Betta, and some silk plants. I can get rid of the silk plants if necessary.