so I'm growing in perlite/vermiculite mix and am having serious issues keeping my PH down. I have gone through almost 200ml of ph-down in 3 weeks. i bring my res down to mid 4 to mid 3 but after i ebb it goes up to 6 or so. I check it again a few hours later and it's pushing 7 so I drop the res back down to and do it all over again. anybody have any advice? journal is here; http://forum.grasscity.com/hydroponic-grow-journals/1206507-first-time-grower.html oh, and i recently split the two strains up so they are on separate res's now. they are all 4 looking better than before but are still showing symptoms of potassium and phosphorus deficiency but are at least growing again. the indicas are in serious need of nutes so i split them up and upped the nute level to ~25% of recommended (measured 225ppm). ANY advice?? please!