Your plants cannot transpire. They need to expel the water in the leafs. You have to heat up your room somehow. Leaf Temps should be 76, not 60 lol. So yea, this isn't a problem with your plants or hydro system.. It's a problem with your Temps. You can run some insulated 8 inch duct, an 8 inch fan and blow your home air inside it. Like if you want to grow weed you will need to bring the Temps up.
Now if you can't raise your Temps.. Create a post on how to grow weed in low Temp environments.
Now im not saying there are not nutrient issues. I dont like 2 parts, seems like you will lack one or the other easier. My 3 part trio makes it easy when topping off. I watch my ppm, if its dropping and my ph is climbing im golden, but if its dropping and my ph is dropping, i need to top off and add the right nutrients. Depending the stage of growth i use a ratio of the 3. I mean its simpler, but like all things, it might not be better. Im not saying the 2 part is your issue, i just know if your ph is dropping shortly after res changes, and your roots look long and stringy, they need a nutrient they dont have, which your pics look like.
Its obv now to me there are multiple deffeciencies, just I will forget about this for a few days then all goes to hell. Plus who do you listen to right. . its all good either way man. . you do whats best for you, I just want you to hear both sides of the story.
