This is a cool idea and looks great.
I would have never thought of doing something like this.
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That link is for some fish exporter. Ebay search also came up empty.TAFKARojo said:Hey I just thought of something....
There was a guy in the Marine DIY forum posting about his product, the "Aquabridge". Its an acrylic tube connecting two tanks allowing fish to swim through freely. His website is www.aquabridge.com and if you go onto ebay you can purchase them cheaper if you search for aqua bridge. I just thought that it would fit your setup 100%