stem rot and nft questions HELP please

hi guys one of my girls has started developing stem rot the guy in my shop says its due to there being to much moisture. I have got another fan and have uncovered the tops of the rockwool and bought bud rot stop to use, is this enough

how can i keep my rockwools dryer?

should i stop my pump from being on 24/7?

does my rockwool need to be on my NFT tray or can i put something under it to keep a space
is it only the roots that need watering?
 
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