I find the lack of an MSDS for the product fascinating.
We could make suppositions, but the base line is NovAqua Plus contains water, some form of sodium thiosulfate, un-named polymers, un-named buffers (other Kordon products use Borates), un-named herbal compounds and a preservative.
I'd prefer to see a chemical analysis before I'll accept that it buffers anything.
That does make it sound a little scary, lol, but that's why I came Here first!

I was thinking it did mention the herb, echinacea and vitamins e,c, and maybe a 'b'? ?
It has been a while since I've seen the pkg... I haven't been to the pet shop in a few months. Other than to get some plants.
And a platy.
And some betta's...
lol
(not for the tank that's troubling though, except for the plants)