Can anyone identify a problem for a newbie?

[Adespo28]

Hit a snag on my WW auto max, up until week six it's been going great. Then noticed the leaves were getting brown spots in the middle and leaf veins were yellowing.( as you may notice in the pics). Also looks like growth is slowing.

Using 250W Fullspec light 250watt, 5 gallon smart pots. PH between 6.5-7.0. Humidity between 40%-50% and temp between 75°-79°

Found some mold on the bottom of the pot, used peroxide/ water mix to clean off. I'm wondering if it's a nute problem or if the mold had something to do with it.

Sorry for the newbie question, any help would be appriciated.

 

[Sancheh]

Possibly a nute prob..that was my first thought after looking at photos..perhaps just use plain old water next time..do u use any epsom salts at anytime??

 

[Adespo28]

No Epsom salts.

I thought it was a Nute problem too. Phosophrus deficiency I think. I was hoping someone with more experience could confirm.

I also wanted to make sure the mold I found on the bottom of the pot had nothing to do with it.

You think just watering with PH balanced water is the best way to go?

 

[Sancheh]

I would highly recommend using epsom salts as part of ur feeding schedule it is rich in magnesium and other micronutrients which also helps to allow the up take of other nutrients that could be locked out..
U said they had slow growth this could be why(lock out)
Do some research on it ,get some,thank me later..

 

[Adespo28]

Thanks for the tip, much appreciated, il pick some up today.

If you dont mind me asking? Roughly how much epsom salt do you use when watering? Research shows me everything from 1 teaspoon per gallon to 2-3 tablespoons per gallon. Have you found a sweet spot?

 

[Sancheh]

From what I can gather its difficult (but not impossible)to overfeed epsom salts...I personally dont think theres a sweet spot with amounts a little goes along way and I've noticed different strains like more than others . I'm sure ur smart enough to research and make ur own decisions on how often and amounts.