Hey Sanchez what's up? Well, feel free to chime in... we're all learning.
EM!! Dude.......... it's on page three, like the middle, in that group of photos. I took a pic of the BAG not the soil itself, so that might be throwing you off m8.
I had 3/4 buckets 'fail' in that those roots ripped off the filters and started clogging the pumps. The last fixative I tried was Marine Grade Sealant and while it was stronger, the roots were stronger still.
Additives. Very few for flowering. I put in the pk 13/14 3-4 weeks before harvest. I also regularly use bananamana. Last time I used Floralicious which was very sedimenty and I'm not sure added anything.
This time I'm using the BioCanna additive Bioboost; which is fermented and bioactive and that's about all I know about it. Oh yeah, as Sam Jackson would say "It's expensive as Hey-all!".
(only out in 1/4 liter right now as far as I can tell)