i have no clue. That was epic though.
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looks like the same fish 4 times but prbly not

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some fish are really dumb and just follow whatever movement they see, example wave your hand in front of the tank and they'll zig zag across the tank 5 times.
(it's really funny to watch when there's a tank full of like 30 fish)
anyway. yeah you can kinda see his hand moving them, i bet that's what it was.