Light green patches on many leaves

I'd guess it just needs some nutes. The exact deficiency is difficult to determine. if low on plant, it's mobile, if randomly anywhere (usually top with areas of more light hitting it), it is immobile nutrient and that can help eliminate possibilities. Find the nicer of the 2 common leaf charts out there. The one that doesn't look like a low-res graphic from a 1970s textbook, lol. you also have to conser and pH problems, as that can cause any and all Tox. and Def. that are possible even if optimal concentrations exist and readily available to the roots/plant. bronzish and intervainal? chlorine of either ttype, boron def, even molbendum def, Fe tox, P causing Mg/Ca def, Mg/Ca def.. Lol... you see what i mean? if you have a complete fertilizer, you should just stick to the instructions. if it has a cartoon graphic on the lable, you are going to run into problems and need all sorts of additives that god knows if it's the correct one you need to be putting into your soil -- and they love it, because it costs you a ton and you have no idea, so you keep doing it :p find a better brand -- long-term solution. Compelte package with all primary and secondary nutrients macro/micro whatever... if you have to buy 6 extra things, it's crap marketing nonsense made to drain you of money. i would guess Ca/Mg as it's the most likely... if in coco coir, i'ts a that plus a possible K-toxicity. Cal-mag is a fairly safe supplement to use. I'd try that. It's definitely going to get worse over time. if not late in bloom, it's worth being proactive in this context. usuaully i say wait and see and be certain before doing anything.. a much wiser way to go more times than not. Amending with some garden lime at beginnign of grow can help with Cal defficiencies, but will do no good mid-grow for you. It takes a long time for that stuff to be useful to the plant. Find something similar, if not that that fortifies soil with Ca/Mg if you always see this deficiency. Calcium def is actualyl occuring long before you see it... 30-60 days.