Join Date: Sep 2005
Location: Jakarta - Indonesia
sadly, no. So far I have only seen such concerete pool/tank hybrid in a local magazine, and it is the first time I have seen it. I did ever saw one myself which is indoor and a bit smaller at 400-500gal. It is a tank owned by an aquascaping supply shop. They make it that way so customers can easily pick whatever they want from the tank. It is actually easy and fun to poke your hand into the bottom and pick by yourself. Really, I love it. The drawback is that the shop built the tank too low to enjoy as a tank, raising it by a foot or so would be great for viewing.
Imagine what else you can do if you have four side of solid concerete instead of glass. You can shape them to look like river bank, stick a plank of java moss by the sides, etc you can think of. It is very clear that you can build bigger this way, because concrete is sure to be stronger than glass in terms of withstanding water pressure (you can always add steel reinforcement and brick inside the concrete).
I have seen such setup everywhere but they are not planted tank. To name some sea world, local aquarium display and in singapore zoo.