On a recent trip to Denver, I spent a night with a newly "discovered" cousin who is a complete delight. One of the many wonders in their house is this fish tank. I was told that more than half the water of the tank was in the basement - an amazing engineering feat. These are salt water fish, as anyone who has snorkled or skin dived would know. I recognized the Clown Fish immediately and knew he was immune to the stinging of the anemone. This was one of the most complete, most "natural," mostly clearly researched and well-cared for tanks I have ever seen.