Is this Mag & Cal or ? deficiency?

[Happy Retiree]

Is there any improvement?

Thanks for asking. No improvement yet. Of the 16 plants we have, I picked off a big handful of bad leaves today. But remember, we didn't flush - in fact we gave the FF nutes 1 more time (before you responded) & watered plain once since then. They're due for another watering tomorrow which I plan to be straight water.