You should email Dr. Maurice Elphick at M.R.Elphick@qmul.ac.uk if you really want to know the effect of pot on fishes. He's done a fair bit of research in the area.  Hooray for neurobiology. As for whether the pot smoke would get into the tank, well, I suppose it's something like a bong right? It would be interesting to know how much would be required. Water volume would be a factor, as well as the size of the fish.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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