Join Date: Oct 2014
Location: Twin Cities, Minnesota
I think you'd be fine. Idk if there are human parasites that might inhabit our aquarium waters, but I have read that most fish diseases cannot infect a human, except fish tuberculosis, but that is still not very dangerous to us I believe.
Some of us get tank water in our mouth when we start our siphons (I did back in the day when I used a siphon to gravel vac). I think that if it was dangerous there would be more cautions on priming a siphon with your mouth.
I think planted tanks, like most of ours here, would be especially safe as the plants might take up any harmful chemicals that are produced.