Looks like a store but i could be wrong, and I have to say, thats a pretty good idea for the home aquarist also. If you wanted to have a tank with things and other things that you couldnt keep in that tank, put them into the tank beside it, while still having the aquascape look flowing and have all the tanks connected to a single sump for better parameter control. A little complicated, but I think you catch my drift.
Mark