For 5 years I worked at a restaurant that had an aquarium. For years I wondered why I would see those patterns in the sand at the bottom of the tank. Now, years later I understand why. Thanks for sharing, it's funny how ideas connect over a lifetime. P.S. Puffer fish can be MEAN, be careful around them.
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I'm happy to have solved the mystery for you! :D
And I plan to stay away from everything as toxic as the pufferfish.