Yellow new growth

Hello friend That bright yellow green in the new growth i would usually associate with iron deficiency if any. However I've had many young plants who had that bright new growth and then it slowly grows out to be healthy green leaves. I don't think nitrogen is your problem, i would double check that your ph is in the right range because that can often be the culprit, otherwise consider adding a calmag supplement that usually has iron also into your feeding, maybe just once a week, .5 tsp per gallon of water. Most likely though your going to see those few center leaves continue to turn green over the next couple days. If you notice, you can already see the tips have a nice green color to them. Happy growing. ✌️