use the silica as a ph up . you said it comes out to 3.9 - 4.3 when mixed .... add just enough silica to your mix to bring the PH up to 5.7 & let it drift from there . if your hand feeding right after mixing , use the silica to bring it up to 5.9 then feed it . 5.9 is the sweet spot for coco's PH . to bring the PH up in your mix with the silica , just add a few drops at a time & retest till you get it where you want it . that willgive you an idea how much you need every time to bring the PH up .
silica can be had in botanicares Silica Blast or dynagrows Protekt .those are about the cheapest & easiest to use . the protekt is a little more concentrated & you'll use less of it .
silica can be had in botanicares Silica Blast or dynagrows Protekt .those are about the cheapest & easiest to use . the protekt is a little more concentrated & you'll use less of it .