get 2 gold fish, and separate tanks.. place an ounce of marijuana in one tank with the fish. place an ounce of tobacco in with the the other fish.. guess which one dies first.. :toetap05:
many flaws how big is the tanks? Is this fresh tobacco or cigarette tobacco ? If you had a good filter none of them would die, But Goldfish do tend pick and if he picked at the weed he would be dead so the weed goldfish is actually more likely to die first.
neither nicotene or thc are water soluble, the fish'll die, but they won't die stoned. don't kill your fish, dude.
what if you just sprinkle some tobac/weed on top as if it were fish food and let em eat at it. that way you don't have to waste an ounce.