problems starting

Well today i started of my CO2 injection system after noting that all
the leaves on my Amazon swords were developing brown spots on them.
It is only a simple yeast reactor now in my 29 gallon tank but it
should be better than nothing.
I also checked my initial water conditions before starting the reactor.
        Hardness was at 55 ppm  this seems extremly soft
        PH was at 7.6 or higher since that is the max on the scale i used
        For lighting i'm using 2 20 Watt GE Full Spectrum bulbs 14 hours
                a day.