I am new to this website and I'm sure this has been covered before. I will be starting a nano tank and will have an auto top off system. I would like to put a container in the shelving unit it will sit on but I am obviously limited by space. The space is about 10" wide x 10" deep x 14-16" tall. What would make for a good ato container? My wife already doesn't like the chiller being exposed on my other tank and she would like if I can put the ato container inside the shelf. Thanks.