Yeah I get that… definitely makes sense. Fairly positive I screwed myself over on this front. Have been looking at beautiful white roots while running orca and prior to the last res change there was a bit of a smell to the nutrient solution so I added in some UC Roots ( I just had it from a while back) for 24 hours ( 1ml per gallon) prior to my change out. New water going in was just nutrients, cal mag, silica blast and bennies and with in two days I have brown popping up on the root systems. Not exactly sure how these good bacteria set up and how long it takes them to establish themselves but I’m thinking that maybe my introduction of UC roots may have hurt colonies of good bacteria on the roots systems and then I killed them off with the UC roots making way for the rot (or whatever it may be) and the new bennies then didn’t have time to establish themselves before this took over. If that makes sense