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I wouldn't put anything in your mouth that came out of a fish tank...esp algae....lol
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If u eat sushi where u Think the nori comes from lol. Id say it all depends on if u use any chemicals or not but u could certainly grow sea weed in a tank and eat it as long as its rinsed very well just like farms that grow the stuff and fish for human consumption. I would definately do a lot if research on how farms do all that before eating it tho. But could be done yes.

