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Take a few fish out of the tank and the rest will move from front to back more readily. The way the algorithm works is this: If a fish hits the side limit (either side), or is in the clear area in the middle, the program checks to see if it would collide with any other fish if it swam to the front or back. By "collide", I mean not only is another fish occupying that position, but could it be by the time the first fish gets there. With 7 fish in the tank, there are very few opportunities for swimming front to back.
You did not read that MA2 would have the 3D background. That is still quite a ways in the future.
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