Please help!!!!

[Poundcake818]

Hey guys. Just trying to figure this one out. Doing a lot of research cannot find much. I currently feed my Kush mints At around 5. 7-5.8PH. I am in 8 inch big mama rockwool cubes. I’m currently using salts.

I’ve been doing this for several years and I have never seen this before. This is the first time I’ve used big cubes. Now I’m wondering if there’s something inside of it causing the plant to react this way. Is there anything I can do to change this? I’m only in week one.

Here are some pictures below!

Ty
Poundcake

 

[SUNHOUSE]

Yeah they are struggling. My first thought is that if the leaf margins remain green and seeing all the necrotic spots between veins and the doesn't look like the leaves are twisted. I would lean towards a Manganese deficiency.