The first thing that comes to mind is Nitrogen deficiency, I've heard of but am not familiar with fox farm, what is the N content like? I would get an all-purpose fertilizer with some N. Loosening the soil could be quite stressfull to the plants and I'd avoid it. Many deficiencies have similar symptoms, so use some ferts and if that doesn't work it may be micronutes, but most likely not. Peace.