It's my understanding that the level at which there'd be too much K is quite high enough as to be almost impossible to get there without it being intentional.
Grumpy's GH does have the K in it, though I vaguely recall Rex saying it isn't quite the same proportions as Equilibrium, but as far as I know they're interchangeable.
The why bother was sort of my reaction to the very low dose here, and my inclination was to not bother at all with the K2SO4, at least it was for quite a very long time. I add the Equilibrium anyway for GH. My additions of extra K are only in the last couple of months, I don't think it makes all that much difference, but as I mentioned my 'testing' isn't exactly scientific and would only really apply to my tank anyway.
