Grow Strong Cup

So week 5 is done!! I’m gonna empty my reservoir tomorrow and fill with fresh water and bontanicare hydroguard I may have gotten some root rot or have some build up… I been reading and they say this is the best for root rot or root issues and help with root mass!! I applied it 6 days ago and already i see the roots now back to white and no build up!! I also think the cause was light leak in the reservoir.. I didn’t shut the lid all the way, but now im on it!! But even with the issues with the roots the plants them selfs didn’t show any kind of problems. I was changing the reservoir on week 4 and noticed the build up did some research got spooked and tried hydrogaurd and the results are good!! Plz feel free to comment down below if you have any helpful advice with dwc and roots.