day 50: a new week started, and the deficiency on the one plant can be seen much better now.. as stated before, i think this has to do with missing the cutover time from pre-fertilization to manual feeding.. it did not seem to effect new growth, but more existing growth, so i'm not really worried in any way. after taking the pictures i did some defoliation and removed most of the leaves that showed the deficiency, as well as some that were blocking the light (also on the other two plants).
day 51: they each got 1/3 liter of a 1/2 strength mix of AN additives (B-52, big bud, bud candy, carbo load, rhino skin and sensizym). I also exchanged the reservoir again with base-nutrients (GHE and calmag).
day 54: i started noticing some trichomes on one of the ladies.. :)