Pics of 3 week old clones(MOLD?))

I have these clones on a drip system and have notice that some of the rockwools were getting this weird white texture on them... I'm not sure if i should do anything to kill it or just cover them up cause they were exposed out of the hydroton...

I covered em up here let me know if i should do anything else? Also im trying to bud in a week... Should i start trimmin up the bottom foilage before or slowly during the bud process

I don't know shit about drip systems but in my soil, it sometimes "molds" over like that. It's because I add Great White which is a helpful bacteria and it isn't harmful. But to be honest, that could maybe not be it. My question is about the third picture. The 3rd plant to the right looks really burned on its leaves. Am I just looking at it wrong?

Trevor said:

I don't know shit about drip systems but in my soil, it sometimes "molds" over like that. It's because I add Great White which is a helpful bacteria and it isn't harmful. But to be honest, that could maybe not be it. My question is about the third picture. The 3rd plant to the right looks really burned on its leaves. Am I just looking at it wrong?

Click to expand...

NO they aren't burnt?? I know what nute burn is and heat stress and that plant is really healthy actually. But i do need help on this white stuff covering the rockwool. Will it spread or will it just die now that i have got the light off of it??