New growth lime green/yellow at centre

Flora micro 6ml per gal flora bloom 9ml per gallon and 1 gram of Epsom salt... You use this.. you will never have this problem .best nutrients ever.. just dilute with water until you hit your target ppm or if they are in flower no need to .just use full dose ... Check your calibration on your pH meter ..we never know when it falls of lf calibration until times like this.. soil keep at 6.5-6.6 coco or soiless keep at 6.0. Cheers,

Hmm, rule of thumb n.p.k shows on older leafs and micronutrients show on newer growth. From the look of those leafs that looks to me like iron deficiency looking at the way the leaf is yellowing from the stem to the tip. If you are using heavily filtered / RO water this could be your underlying cause. Iron deficiency is really a rootzone problem - overwatering or wonky pH can lock it out. Suggested fix: Test run off pH - flush and balance if required. Add some Calimagic or Fe booster to your feeds - avoid high zinc manganese and copper nutrients. Iron def is treatable and if you get on top of it quickly those leaves may even go green again.