First time grower here. I just noticed the tips of the leaves on my AK47 auto turning yellow. I have her in a 5 gallon pot with biobizz light mix soil. She's about a month into veg and I last fed her about a week ago with a half dose of 6-4-4, so I don't think I burned her. Could it be a N deficiency? I'm not sure what else it could be. Thanks for the help in advance 
