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Hello! Thanks for your concern but if u look at the design ..... this is an optical device..... it does not even have an antenna! They are just audio amplifier circuits driving lasers and speakers not radio transmitters.
I'm so happy my instructable is exciting! Isn't science AWESOME!!! And for sure your goldfish could live in the fuel cell because the water and muck are all from typical fresh water habitats that would support fresh water fish! As a neat experiment you could buy some Ph and other water test strips from a pet store and test the fuel cells water quality at the start and a few days after its running to see if the acid levels go up or something before you put a fish in..... Also you can test how doing water changes (to keep the fishtank clean) affect the voltage! There are so many variables and who knows what you might discover!
Hey! It prob won't work with sand..... Mud may work but muck from a wet land like a pond or marsh or bog works because it has the GEOBACTER bacteria in it! Ps the fish is only to show how safe the fuel cell is and natural..... It doesn't need the fish!
wow! Great job!!
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