Can anyone tell me why the new growth is yellow? This is a magnesium deficiency right? What are the possible causes of new growth like this. I dont feel like explaining everything about my grow, but they are in fox farms HF/OF mix. about 4 gallons of soil each. Today I flushed 1 of them and the ph was about 6.8 in the runoff. They all got 1 recomended dose of calmag/botaincare bloom 1/2 dose of humbold bloom and a tiny bit of humic acid,molasses and they got 1 dose of humboldt grow during veg. They about 1 week into flowering. I used alot of RO water. And just recently this last watering i used bubbled tap water. Im 90% sure its a deficiency, just not sure what. These are 4 cuts from 4 other plants that I have grown before. Well, they had this same deficiency last time at the same point. And last grow, I had to move my plants and let a friend finish them outside. He used calmag and probloom from botanicare with bubbled tap water and it got better. I didnt get to ask how much of what though. He might have had to flush or who knows what idk what he did really. but he did say he used those nutrients and that it was a deficiency when we dropped them off to him.