Even recently I had considered draining the tanks near the window using your same method. Youngsters seems to find fish fascinating. They can also stake an interest in the fish if you allow them to name them. I had an Indiana Tiger. One of the kids named it "Jones" or "Jonesy". I inquired why Jones? I got the standard exasperation in response. Later it came to me...Indiana Jones. But she staked a claim on that fish.