I have a question about this supper tank I'm right now looking into the possibly of building a good sized cement tank in one of those arch shaped steel garage buildings or steel pole barns that I'm looking at into building when I get my first place. The idea would be to build wooden cement molds for the large cement fish tank with a viewing window or two and have them add cement to this thing when they come to build the foundation of the steel garage like building. The building would be built to house a large train set and to give a place to park a car or two. But I think a large fish tank might do really good in it if it's a Cold water fish tank and the moister from the tank wouldn't effect the outdoor metal building as badly as if it was inside a house.