older leaves yellowing, then brown spots

its in foxfarm ocean forest soil, great stuff. its about 1 or 2 weeks into flower. the fan leaves turn yellow, get brown spots, and fall off. all the rest of the plants younger growth is green. white hairs seem to be coming in all right too.
i checked pH its 5.8-6.0 the meter changes a little bit. its brand new i just got it two hours ago, a digital one.
im thinking its nitrogen deficiency. since the older fan leaves turn yellow
maybe overwater it rained very heavy but ive let the soil dry out.
the stems are purple too! phosphorus deficiency?!
heres the thing tho, ive been fertilizing with organic teas.
1 tablespoon ewc's, 1-1/2 (0-5-0) batguano since the P is so low in it. and 1 tablespoon molasses. every two weeks they get this. i oxygenate the teas and everything, i also put a some compost on the top of the soil to amend for anything im missing.
whats the deal? no pics because no camera.
maybe there was a problem and i already fixed it and she just needs some time to grow back to normal and im just freakin out?

and i have another plan that is about to start flower in a week or so im estimating, its one week younger and its in the earth, it is totally fine. same nute regiment and everything

heeeeeeeeeeeeeeeeeeeeeeeelp

You might have a fungus like downy mildew, or power on the leaves. A product like seranade will work. use it once a week til the problem goes away. A Pyrethrin fooger will kill any thing moving.

You might have a fungus like Powdery mildew or Downy mildew. Spore can spread to other plants quickly. A product like seranade will work. Remove plants from grow room, clean grow room to remove left over spores. Then put treated plants back in the grow room. Use it once a week til the problem goes away. Also Pyrethrin fogger Bomb will kill any thing moving.

jfrezy said:

You might have a fungus like Powdery mildew or Downy mildew. Spore can spread to other plants quickly. A product like seranade will work. Remove plants from grow room, clean grow room to remove left over spores. Then put treated plants back in the grow room. Use it once a week til the problem goes away. Also Pyrethrin fogger Bomb will kill any thing moving.

Click to expand...

nah i dont think its a fungus im pretty sure its a nute def/pH lockout problem. i think its fixed now ill get some pics up to show the damage it did. pretty much all my lower fan leaves are gone. my plant is pisssssed