I use recharge in coco as a root drench every couple of weeks, if you read the ingredients it really has all the microbes including the food they need. As much as I like it, it is not for water grows unless you want black roots and clogged pumps. I alternate every other week in coco do a root drench in coco with Amino and Humic Acid, that is over kill but it keeps me happy and I am on a mission to hit a brix of 20%. I put Orca and Hydro guard in the auto feed res. Orca is Great White in a liquid form.
I stopped using Mycos WP in, drain to waste and recirculating water grows after cleaning out the out the res and totes a few times. The people at Extreme tell me what doesn't dissolve and has to be cleaned out is the vessel that carries the bacteria but it makes a freaking mess in the res and ever grow site tote. So I use Orca its liquid and it can swim so no mess to clean up or discolored roots works great too and I use Hydroguard as much out of respect as anything, it saved a few grows for me and I wont forget. This grow I am going to try Tribus Original and see how that does. I also started using Flora Blend in the last grow but I didnt use floralicious, I think that may have been a mistake. I will find out this grow.
I measure my root ball by the amount of water they displace when I do a res change. The last grow they took up the equivalent space of over 10 gallons in six 13 gallon gallon grow sites and one 13 gallon control bucket. For years I didnt foliar feed but I started 3 grows ago, what you feed your roots should complement your foliar feed. My rule is if it stains the roots use it as a foliar feed up until about the 2nd week after the flip.