This looks like it needs some magnesium in it. but calmg has that as well.
You may want to lower your PH a bit, to like 6.5-6.8 In outdoor soil grows you don't need to balance your PH, indoors I find it needs a little something.
You could use Epsom slats as a quick fix.
about 1tsp per gal.
Best Of Luck
Just stop and look at your plants for a moment ...... leaftips are burned and are yellowing .....some guys here even saying to increase feeding LOL stop feeding it so heavy they are overfed
@Barb420 Hi Barb you actually answered your own question when you mentioned the PH is at 7
you see the plant cannot access the nutrients it needs at that PH
for optimal uptake it needs to be lower than 6.6 preferably with organic soil I like mine at 6.4 or at the very highest
6.5
Das ist ein beginnender Mangel, an vermutlich mehreren Dingen; nicht nur Stickstoff.
Bring Deinen PH auf 6 - 6,5, damit machst Du die meisten Nährstoffe zugänglich.
Viel Glück!