Grow Info: -4x4 tent with 4in exhaust fan/passive intake -600w timber cobs vero29 3500k -FFOF soil / perlite / no nutes yet since soil is quite hot -Light training and topping on all plants -Currently in veg with 18/6 lighting Oh boy.... I think i got a problem on my hands. So I noticed a strange "dead" looking spot on the leaf of one of my smaller plants a week ago and didn't think much of it. However, I noticed a second one on another one of my bigger plants and some small, pointy feeling yellow dots on a 3rd plant today. This is my first grow so this is my first time experiencing this issue. I did some research and found that it might be leaf septoria but I wasn't 100% since the infected leaves were towards the top of the plant not the bottom and there is just one spot on the whole small plant not multiple. Maybe I am just trying to be optimistic but could it be a cal/mag deficiency? I am feeding all of my plants dechlorinated tap water at ~75ppm.