Thank you. I’m quite sure it has pH buffering additives.
I would consider foliar feeding, but perhaps not a drench.
How about if I were to rub this concoction onto a few leaves instead of a full spray?
Maybe I’m overthinking here. I have just given them a full dose of fertilizer and we shall see what happens in a few days.
The good news is that it doesn’t look quite so bad in regular light as compared to under the LED