thanks for the links. very cool ideas! the hamster setup for the dwarf puffers was quite original.
Instead of a pond/tank connection, I was envisioning two inground ponds, one inside a sunroom and one outside, with a stream-like channel in between. A pump would flow water back to the indoor pond. The stream between two ponds isn't the issue, I've seen this setup between two outdoor ponds. The issue is figuring a way that can shut off the stream and keep the fish in the indoor pond during the winter. I think I need to research the panamal canal.
I was inspired for it when I saw a swimming pool that flowed under a wall so that it spanned inside and outside. Of course, it isn't meant to be drained nor sectioned off. But it did get me thinking about how cool it could be to have fish swim between inside/outside and somehow have the benefit of keeping them inside during winter.
Well, the thread was about crazy setups!!
So far, the setup is to have the indoor pond with a ledge that when the water reached a certain height, the water would flow over and fill the stream. To cut off the flow, bring the indoor pond's water height well below the stream's depth and of course the ledge and somehow shut a door or something to seal off the wall. Since it's a sunroom, the sealing probably isn't as crucial.
*sigh* i can see it...

just don't know all the details.
