Help me out with this deficency

any ideas on this ? using RO advanced neuts 345 tds ppm hydro

Ok here are some more pics of today. Am i burning it with nuets or is it like a cal mag def im using advanced ph perfect in clay pelets using ro 2 weeks old

I made a cal mag foilet spray that doesnt seem like its doing anything so mybe im burning pls help me out before its to far gone

This is todaya pic last night i added for a total of 65 ml sensi grow a 65ml b, 10ml voodoo juice ,20ml cal mag, 5ml revive, 10ml b52, ro water 5.5 gal temps 68 to 79 water temp around 68 to 71 nft drip hybrid.

How are the roots? Is it being kept at a consistent temp?

Roots look good the temps do fluctuate by 3 degrees

Roots are white no slime