That was and is really cool. I hope to do one outdoors where I can walk underground and see into the tank kind of like at sea world. I would love to put a African Goliath Tiger Fish and watch that freshwater monster lurk around.
Could we get an update on how your tank is doing? I'd love to see updated pics. Hope it's doing great!
I'm considering building a variation of this in my basement.
I also work for one of the leading producers of concrete in the world, so I'm going to try to get some tips from our concrete tech department.