Just a question.
I know Seachem's Prime contains some sulphuric compounds and therefore smells kind of bad.
API's ChlorXChange smells kind of neutral to me. I don't recall bad smells from API's Stress-Coat (ran out of it).
Tetra AquaSafe, on the other hand, really smells bad... or is it just me? do I have a damaged product or batch? All my bottles of AquaSafe stink!
I do have a sensitive nose, and I still drink, from time to time, unwillingly, some sips from tank's water during maintenance. No bother with the 1-2-3 video, I use that method most of the times, but some habits die hard and at least one of the tanks I keep doesn't have room enough to do the trick.
Pepe
Santo Domingo