I use pro mix and love it, I add perlite to mine for better drainage and some people add guano or castings for food but I don't
its great stuff.......just be warned that if you are trying to go organic, promix contains a chemically based wetting agent called AquaGro. advanced sunshine mix #4 would be a similar product that doesnt have this wetting agent in it. again, promix is great stuff. i highly recommend. -OSUB
why do you want to keep it so much lower? and why dont you guys just get the promix hp? doesnt that already had perlite in it? Looking into using promix this year
trying ProMix BX for the first time this year, Mandala Seeds says it sucks and to avoid it but more people say it is good if you add a little organic nitrogen and phosphate to the mix after you start the seeds in straight promix.