Any idea what this could be? Need help

anyone know what this is?

Super soil
Quantum board lights
Water ph to 6.3-6.7
Run-off normal
Only added nutes are silica and cal mag

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It kind of looks like calcium deficiency… have you sprayed them with anything recently?

Can you do a soil slurry test for pH? Do you measure pH from runoff?

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I do measure from runoff on 5 different plants all good. Im increasing my cal mag because that was my thought too. No foliar spray

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IMHO you can’t really overdo Cal/Mag as long as it is low in N

High performance lights make plants calcium hungry so supplementing with cal mag is usually a good idea.