I’m pretty new to growing and this is my first full run under leds I have her under a sf4000. My question is what deficiency could this be I only see discoloration on the top new growth and barley any on any older leaves. I’m growing in coast of maine soil and fed her 16 days ago with hgv nutrients and in between that feeding I gave her some cal mag a week ago because I thought this could be magnesium deficiency, but I’m putting this on to double check if this is even a problem or i just have my light to close. The light is about 34 inches away and at 60% power. I’ve been watering every 3 days and was going to water today with some epsom salts, I just wanted to post this to see what I should do before watering.