Well that's interesting!
What has had me wondering also, is that only a tiny amount is dosed, which I would have thought would make little difference to the total amount in the water, yet it had a very good effect. Bit of a mystery
Also, it is not that zeovit have got some secret ingredient in it or anything, because the first potassium I ever dosed was not the zeovit one, just commercially available potassium chloride, a tiny amount, and the effect was quite marked. A few days ago I heard from another respected reefer on this forum who said he tried it, but there was no effect! So - there is still much to learn.
Just one thing I'd say to anyone thinking of trying it, be careful not to overdose, keep the amount tiny. Also, as far as I can tell, it only works if the acros are already showing nice colours, it's not going to colour up brown ones or anything.