Yellowing And Dark Spots?

I got some kind of problem a few days ago it started with the leaves turning yellow and then it started to get dark spots near the tips of the plant and its gotten worse and getting to the other leaves.
Im growing an autoflowering strain-60 day wonder
Using FFoF soil and didnt feed it anything yet also im still waiting for my flowering nutes to come.
Temps around 75-82F Humidity is around 30-40%

and its 27 days old started flowering about a week ago.
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I would go ahead and use half nutes looks like a Nitrogen def.

im not using any nutes I heard FFoF has nutes in it for up to 30 days and Im still waiting for my flowering nutes to come.

Depending on how often you water they usually wash out during the first two weeks.

I use the same dirt. i run shy of nutes within the first 7-10 days. usually by day 15 if you havent added any nutes you will have a serious deficiency or several for that matter.
I would PH some water with nutes and feed them. I would also transplant inot a 5 gallon pot (at least a 3 gallon)
remember not to overwater, but dont let them get so dry they wilt heavily.
good luck

I just got my nutes today FF tiger bloom and Im not sure how to use it.
Should I have bottle of water with the nutes and another bottle with just water?
And how many times should I use the water with the nutes ? Should I one day use regular water and the other day use the water with nutes?
If its important I water once a day.

The leaves are now turning purple and the lower leaves are getting yellow and crispy. Still no idea what this is anyone have a clue?

If you haven't been running low temps and thats happening it is a deficency .Phospurus def . can purple the leaves as well as others . Never had that happen unless temps was low . If noone chimes in with a answer go nose around in the plant problems section and look for similar problems and you might find an answer.