Nitrogen/Magnesium deficiency?

Hello everyone!

I think I've spotted some Nitrogen/Magnesium Deficiency on my plant.

Plant is 3-4 weeks old, lower leaves have been slightly yellowing and a brown spot appeared on one of the leaves.
So I fed them nutes, the flora series of GH all calculated with a chart.

So I've fed them 3 days ago now, it seem to be comming a bit more greener, but the leave with the brown spot just got worst, another brown spot appeared and the tip is curling up, so magnesium deficiency?

Here take a look on at the pictures.



If it is magnesium deficiency, should I just plain water next time or should I put some more Florabloom (Got some magnesium in this bottle)?

Or should I get a product specially for magnesium?

Thanks for the replies!

You need a calcium and magnesium supplement. If using GH then get the General Organics CaMag

Adding other nutrients I would think would burn the plant seeing as it's still quite young.

Alright, thank you so much for the reply!

Should I give some ASAP or wait until the soil dries out?

Wait for your next feeding as not to over water... At least that's what I would do

Alright, thanks again!