I will be acquiring a 20 gal tank and it has a mirror back which is part of the tank as in not a stick on backing. Does anyone know if this is a freaky thing for the fish and if anyone has successfully managed to scrape it off. I don't know how good it looks either. I know terraniums can have a mirror backing like this, perhaps it was not meant for fish at all. Do you have such a tank? What are the benefits to a mirror backing?