It's a hobby of the owner. Don't know how much he charges for one of the giants but I know that he has to inspect where they will be living before he considers selling. It's a great planted tank. I love to go there and just look at it from time to time. Makes you feel like your inside an actual lake.
This is my simple religion. There is no need for temples, no need for complicated philosophy. Our own brain, our own heart is our temple. The philosophy is kindness.