My son owns a small business here in Australia, that cuts and etches, among other things, acrylic.
So we designed the tank and laser cut the acrylic to suit. He's only just started really and he's still trying different things to see what sells etc.
I suggested he may be able to make and sell these small, custom made nano tanks, but he thinks he'd have to sell this one for example for about $250-$300 AUD and he believes people wouldn't pay it!
I said I've seen guys pay 100 bucks plus for a nice piece of driftwood for their tank, so who knows!
We might have to make a few more variations, then maybe visit a few LFS's and see if they might be interested in promoting them?
I had an idea to, maybe do basically the same as we've done here, but create a tank in the middle so that the tubes go "through" from the tanks either side,(if that makes sense?) and the middle tank could house a nice betta? Would be cool to see the fish swim from one side to the other safe and sound. Perhaps a bit cruel on the Betta though, he might get a bit agitated?
What do you guys think, cost-wise and any other ideas for variations on the Nano Tank?