Are you sure you have a 4dKH solution inside your DC? If not, it will give a wrong color indication.
With the wisteria that may be true, as it is streaming from the end where I trimmed it to make 2 plants out of one from my other tank.A solid stream of bubbles like that is most likley an injury of some sort. Possible some minor tissue damage right at the surface, I am not forsure though.
Just for future posters:Yes, that is the solution that came w/ the whole CO2 system. After going out for dinner and coming home it was the right color green.... weird. I thought those things changed in minutes, not hours...