Hi guys does anyone know what can cause this the problem is on the bottom of the plant leafs

[Begginergrower]

I don’t have much leafs that have this issue but i am trying to sort it out before it is too late any help would be appreciated they are under 300watt lumatek pro light intensity is on 50 and they are 4 weeks old this is my second grow and can this be fixed at this stage or should i start over ? Thanks guys

 

[Gmix]

Are you in coir or soil
How close is the light
Are you feeding them organic or synthetic nutes
If synthetic what’s your ph
how warm is it
Can you post a pic of the whole plant

 

[Glomus]

kind of looks like a K deficiency at first glance, what soil medium are you using?