Please help

this was my fastest growing plant it only about 20 days old a couple days ago this brown started showing on the bottom leaves. check my grow. https://www.rollitup.org/newbie-central/243335-first-grow-will-work.html

interveinal chlorosis

You have a mag deficiency. water with some epsom salts..u may have a lockout.

feed the leaves for the time being untill u can fix the prob

ok thx + rep. how much epsom salt .disolve it in water?

1 tablespoon Epsom salts/gallon of water

If ur gonna foliar feed...do it at ½ teaspoon/quart of Epsom salts

on another thread i was told it nute burn. i have them in ocean forest. i gave them 1 tsp to a gallon of grow big when they were about 13 days this is the only thats showing probs so far. do u think it could be nute burn

no...nute burn always shows in the tips.