The question kind of reminds me of the old joke about fixing the car! The guy couldn't afford to fix the brakes so he had the horn fixed instead. Good plan until he came to the railroad crossing!
We know that vaping eventually kills people, some sooner, some later, so worries about what it does to the fish seems to be kind of useless, doesn't it?
Putting unknown chemicals in the tank water is not good but then putting them in your lungs is worse.
Do not expect your government to protect you from yourself!