im thinking this is it? it doesnt look like cal/mag becuse its usualy the whole leaf but not the tip i havent been overferting i have ongly fed them once since they rooted like a month back. any idea?, fyi this is just the bottom leafs nothing on new growth and it looks vibrant and green
I'm no pro, but I'd try throwing a little food at it for sure.. If you haven't fed in a month, I'd be leaning towards it being deficient.
Give them a balanced fertilizer and that should take care of it. Start with a 1/4 or 1/2 strength dose