I keep seeing people talking about Nano tanks, but I can't seem to find anything on google that explains what it is. Is it a brand of tank? A style of tank? If you could point me to a link that would explain it, or tell me about them yourself, I'd appreciate it. Everyone seems so enthusiastic... and from the little I can tell it seems like small plant or reef systems so I am interested in getting one myself if I can find out more about it.