I would like to try an octo. My first. I have a 10 gal. I'm not using. I could go bigger if necessary but I'd rather not. I would like recommendations as to what kind of ceph. to get and where to get one, and how much to expect to pay. I live in Iowa so the cold this time of year might be important. Not that it would be kept outside in my pond but the shipping. thx Frog