Hello guys, it is my 1st grow, read a lot but I still need practice. The plant has been 24 days out of the soil, microbox 0.09m2, 35W CREE led + 25W full spectrum diodes. Yellow tips started showing when the plant started to preflower. I only used 3 times plagron power roots and no other nutes since I have Plagron Growmix and the girl was showing no deficiencies. What could be the problem here? I read that it could be nitrogen excess, but I didn't feed any. Girl was perfect till flowering started, could it be some sort of deficiency? Should I drop power root and give her only water? PH of water I use is 6.3. Never used too much/too little.