Weird spot, And edges dying. Need some help please!

ok so I got two plants the one on the left is a royal drawf auto, right is the moby dick xxl.

2x2x4' tent
4" exhaust and intake with a carbon filter
Sf1000= 100 watts led
3 gal fabric pots
Dwarf is potting soil and coco
Moby is only coco
Feeding ff trio 50% every other watering, watering every other day 1 gallon about ( half that for the dwarf)
Temps run around 65 to 83
Humidity 40-60
Ph is ranges from 5.8-6.5 for (moby) and 6.2-6.8 for(dwarf)
We are in week 5 total. Just started flowering about last week.

I think its was a cal mag def because I might have forgot to put it in. So I added a full dose with the regular water. Please help this is my first grow. Any advice would help alot.

Looks like nitrogen deficiency

I'll add some more nutes and try. Ty

Coco should be fed everytime you water.
And i honestly wouldnt use fox farms trio. Tigerbloom likes to really drop ph and builds up salts fast. Imo
I also recommend a cheap (15$) ppm meter.
Makes it easier for you and us, if you have questions to ask here.

I have a ppm meter I fed with about 850 this time and my run off was around 200. My tap water has a ppm of 23-26