A buddy of mine has a comercial grade chiller that runs on 120v and I'm thinking of getting it and setting up a 70 Gallon cold water reef tank. He doesnt know the specs on the chiller, because it was his moms. But he says it's about 3' x 3'. This seems big to me, but you think it would be way overkill? Or are most chillers pretty large? Is there such a thing as having too big of a Chiller?