I’ve been growing some indoor for 3 months now and the new growth seems to be having a big problem on just one out of 4 plants. A friend said spray cal-mag on it twice a day for three days but hoping to get a professional opinion incase this isn’t accurate. This is my second year with a more serious approach and learning a lot from you guys! Growing in a 5×5 vivosun tent. 10 gallon smart pots. (I know i should have gone with 5-7g if im doing 4.)with fox farm ocean forest. 1500w bestva full spec. led light. Ac infinity fans…well ill stop rambling and just show you some pictures. Thanks dudes!
Check your soil ph. You didn’t mention how much you feed and at what ph. Something tells me it’s likely to be lockout possibly, but not enough info here. Are you only feeding foilar?
New growth will not show calcium deficiency first. So not calcium. Ph issue or salt buildup.
Foliar spraying twice a day seems like a lot. Usually 2-3 times per week is plenty. Also if you spray with lights on the leaves may be getting burned.