Beneficial bacteria in Nft setup

Hello,
For a while I've been thinking of working with beneficial bacteria in my Nft setup instead of H2o2. I've ordered a small bottle of great white for now.
My question is
1. Has anyone tried great white in a nft setup?
2. My water moves 24X7 and will this affect the bacterial life?
My main reason of doing this as I've had terrible luck with a white mould fungus which has been plaguing our system for over 6 months. Finally things are seeming fine the moment I stopped using H2o2. However I'm not seeing any root growth.

Let me know what you guys think.

I ran hydrogaurd in nft for a couple years with no problems. I’m using southern ags garden friendly fungicide now, seems to work just as well as the hydrogaurd. I haven’t tried great white yet.