Help identifying disease

Growing indoors
She's a baby (3 weeks now) autoflowering strain in a 3 gal pot. Yesterday I watered it properly for the first time (watered until I got drip on the bottom of the pot)
Growing in soil.

I got this problem:


Older leaves look like this and are drying out while there is still healthy-looking new growth. She responded very well to nutrients. The first leafset is almost completely dried out I think I might have to remove them Help pls

without any other information....
over watering?

butsack said:

without any other information....
over watering?

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It's been like this for a couple of days. And I've only properly watered yesterday. I searched the info and overwatering looks a lot different on other plants (all leaves look lifeless). However new growth looks perfectly fine. In fact, she's fattened up quite a bit since yesterday under a 45 Watt CFL. I would like to provide more info but I wouldn't know where to begin. First grow btw.

Extra pic might help

grapefruitmarmalade said:

It's been like this for a couple of days. And I've only properly watered yesterday. I searched the info and overwatering looks a lot different on other plants (all leaves look lifeless). However new growth looks perfectly fine. In fact, she's fattened up quite a bit since yesterday under a 45 Watt CFL. I would like to provide more info but I wouldn't know where to begin. First grow btw.

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What's your soil mix? What nutes do you use? do you test PH value?

kinda looks like Phosphorus deficiency.
what are you feeding them?

What's your soil mix? What nutes do you use? do you test PH value?

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No I did not test PH value. Nutes are 7-3-5. I threw away the packaging for the soil but from what I can recall it wasn't hot; PH 6-7

kinda looks like Phosphorus deficiency.
what are you feeding them?

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I figured phosphorus def too at first, which is when I started giving it 7-3-5 nutes. Do you think I should go with "bloom" nutes?

She seems too young at 3 weeks to have defs,i think you might have a root problem.http://cannabis.com/growing/pests-how-do-i-recognize-and-prevent-root-rot-in-soil.html
Just my guess.
GL.

robro said:

She seems too young at 3 weeks to have defs,i think you might have a root problem.http://cannabis.com/growing/pests-how-do-i-recognize-and-prevent-root-rot-in-soil.html
Just my guess.
GL.

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Thanks man. This really helped me out

Always use perlite in soil,youve created a perfect home for pythium,it can only live in anaerobic conditions.

robro said:

Always use perlite in soil,youve created a perfect home for pythium,it can only live in anaerobic conditions.

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Makes perfect sense. I do have some good news though: I trimmed off the bad leaves and she's looking better than ever. I used the pot within a pot method to avoid overwatering and when I removed the inner pot I may have damaged some of the roots and she's recovering... only a theory based on how good she's doing now anyway in my future grows I am definitely looking into perlite