Newbie granny needs help please

Hi, I'm new to the forums thing. My son is a computer guy and pointed me in this direction. I'm growing dwc in some tents and there going great, I love them. But I recently got to grow in a room my neighbors wanted to retire. I use the same setup as I do at home but I'm getting very different results. I may need some help... At home I veg with 400w led mixed with 150w mh. Flower with 600w hps... Now I have 4 gavita 600-1150w in a 10x20 white room... Already I'm getting these 2 problems. No issues in the tents at home. Never even lost a clone. In the big white room I'm have crazy ph drift, looks like gnat larvae and nute clumping. What the hell is going on?

looks like root rot in that one pic.

you running sterile or with bennies?

Something bad is living in your res. You using same nutrients?

My guess is the more intense lighting is causing the water in your buckets to be warmer leaving them more susceptible to pathogens growing in the water.

That is weird about the larvae. Only get the occasional spider where I live. I dont know much about bugs, but i'd say if there are larvae there should be bugs flying about. Do you see any?