More yellow leaf questions

Any ideas what could be causing this yellowing. Its raspberry cough, grown in clay using flora trio with ro water 80°f and 65% rh
18/6 lights tsw2000 drawing 400 watts

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How close do you have the light?

About 18 inches

Notice how its starting between the ‘veins’ of the leaf. That is more then likely a calmag deficiency. Being in clay pots makes ur grow pretty much hydro (soilless) and all soilless growers should supplement calmag at earlier intervals then soil growers. Add her a few mL next feed and she’ll be fine. Dont forget to pH properly.

Thanks very much for your advice.

No problem! Welcome to ILGM and best of luck