Variations :
Background Color: 5 (x2: color Inversion)

The placement of the bubbles,
the height of the tropical fish's bodies,
and the color of their fins are mostly random,
but the six fish within a single piece will be of the same family of colors.

Key Input:
s: screen capture (.png)
g: save image 2048x2048 (.png) (Moving bubbles are not drawn.)
b: display bubbles (ON/OFF)

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