Grow #2 - First Time Indoors

Everything seems to be getting both deficiencies and toxicities. Always the most confusing part of growing for me. Ph is fine, double checked my meter with test strips. Stepped back on nutrients for the time being, but it hasn’t appeared to help the sativas - they are at least 4-5+ weeks out and the fan leaves are being eaten up quickly. GDP appears to be okay, Northern Lights showing some burn on the edges.