thats the same with my set up, im using Flora Duo, calmag, silica by GH and i stopped using silica now that im in flower and my ph is 5.8 to 6 spot on. the silica isnt needed now, as ur stems and trunk are established. i was told by many to not start KB until flowers are established.I'm sorry I also use Silica at 1.5 mil per gallon it raises my pH so I have to use pH Down if I don't use Silica my pH is spot-on 5.7 or 5.8