HELP before I lose my plant

[Carri]

In coco coir blend potting soil, in one gallon pot, watering with rain water every 2 - 3 days, have not applied any nutrients, plants are 2" to 7" tall right now. Smallest one has tan spots in middle of leaf about the mid leaf. Just noticed this morning that one of larger plants has one tan spot in middle of leaf, one of top leaves. PH is 7-8 in all 9 plants.

 

[growell]

I give them a feed mate looking a bit lime colour i think your ph is high as well usualy 6 to 7 but i dont grow in coco

 

[cybersmib]

Coco needs nutes.

 

[homegrown]

By looking at your soil mix it appears to be more of coco than soil...I think your ph is way too high(should be around 6.2-6.5) and they're in need some kind of food at this point. Are you supplementing them with cal/mag? And lights at 8" is risky unless their cheap lights for seedlings.

 

[3Berries]

Not many nutes in rain water, some N but no Ca/Mg.