spotted leaves

I have 4 clones that I started the start of april outside with supplemental lighting. They all look mostly healthy but 1 of them is having spotting on the lower fan leaves and I can't figure out from pictures online what exactly it would be and if I need to worry. Wondering if anyone has any...

Could someone please help me figure out why these 2 1/2 week olds are not doing as well as I’d like? On a 18/6 light schedule 400w metal halide bulb 22inches away from top of plants, I water every 2 days (about a 1/4-1/3 a solo cup of water) ph around 6ish, the soil I’m using is the soil in the...

i need some help, underneath my red/blue spec lighting my fan leaves looked bronze spotted so I trimmed and flushed my plant .. its 8 weeks in the life cycle and 2 days after flushing thinking it was nut burn or nut lock. the same issue is starting on most of the leaves ..1st pic is under my...