New Grower Pictures, bottom leaves turning yellow diagnosis help anyone??

[Warrior]

Hi guys these are the pics of a couple of plants where their bottom leaves are turning yellow, I suspect possible heat probs or feed? can anyone help? The soil has been recycled and they are been fed on Dutch Pro A + B and silicon hope the pics help. I am also keeping the feed PH at 6.2 All feedback will be massively appreciated in advance:tiphat:

 

[Warrior]

Where's Muddy when ya need him????

 

[RebelRoy]

I would upp the feed bud. that is clear signs of hunger :smokebuds:

edit: try to fill in all the info you can bud, makes it much easier to solve the prob. have you been testing your runoff ph?

 

[toke]

this may help
Deficiency Pics



toke

 

[Warrior]

Hi Roy thanks for that, I do suspect the same and have give them a good feed today, the Ph in the soil seems fine I have a soil tester and it is reading approx 6.8