I have one saltwater tank up and running. It is 75 gallon with 65 lbs live rock. It houses a pair of Ocellaris clownfish, a Hippo Tang, a neon goby and a brittle star. My lighting isn't good enough for coral although for now I like it as a fish only AQ. I also have a 12 gallon NanoCube Deluxe that is empty at the moment. I'm thinking of eventually devoting it to coral.