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Fish #1, which you grabbed away from whatever it was doing, still has all it's former parameters associated with it. If it was in the rear tank, or passing from one tank to the other, or up against one of the edges (or any number of other scenarois) - it will continue to act in the manner dictated by its previous position and velocity. Often, it will pass through objects expecting a boundary limit that just isn't there. The other fish will also be affected by unexpected collisions.
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