I am a complete beginner I have never had a betta but have wanted one for a long time. My husband did not want one in the large tropical tank but bought me a small 30 litre tank which I have now set up and am waiting for it to cycle. What I didn't think about until I had set it up is that the back of the tank is a mirror. Does this mean I won't be able to keep my fish in it? Advice please!