First grow setback

[Jerry Cush]

Hey guys, my first grow, three plants (unknown strain), indoor, under LED lights from China, Miracle Grow potting soil, watered daily with tap water (7.8 ph), 8 weeks old.

They were doing great until a few days ago when this condition began. Any ideas about corrective measures? Thanks.

 

[principlesarelife]

Cal mag deficiencies

Your ph should be closer to 7 for soil, if I'm not mistaken

 

[Sobeit]

Appears to be potassium deficiency. Are you feeding nutrients?

 

[Jerry Cush]

Appears to be potassium deficiency. Are you feeding nutrients?

Miracle grow, half strength, once a week

 

[Jypsy Dog]

Miracle grow, half strength, once a week

If your going cheap... Use a Tomato Fert on it.

 

[Sobeit]

Miracle grow, half strength, once a week

What is the NPK? It closely resembles K deficiency. Also the nitrogen seems rich, usually MG is high in N and K, idk, try pH the soil. You can tell it is the tissue effected, not the veins, some tips appear burned/decayed and usually in older leaves, decay spotting.