Please help DWC Hydro system Burning bottom Leafs....

Please help me!!! I have a few ideas of what could be wrong but im not sure. First try at hydro, But not my first grow.

Heres the specs.


DWC Hydro System
2 Airstones with aqua High end air pump, Plenty of air in the water.
10 Gallon Container.
Strain is "Haze" Nirvana seeds.
Only Nutrients used are Fox Farm Grow big
PPM = 250
PH = 6.5 (having to bring it back down daily...???) Raises to 7 - 7.5 if not checked daily
Temps are 75/80 Off/On
RH is 40%

Oldest leaves are yellowing at first followed by small brown spots, turned into full browing and dying off of the end of the leaf. Now its working up to the second set of leafs and is starting to yellow and developing small spots, I was thinking an Mn (manganese) Difficency, But not sure, Please help.

Thanks guys

whats your water temps? dont want your water too warm. aswell youd want PH from 5.5-6.0. the PH youre running is soil based PH of 6.5-7.0. id definitely get PH down some try for 5.5-6 range. everything else seems a go. check them water temps making sure youre not too warm to breed algae or molds..

Peace

check the roots for rot and the hydroton for white residue . what medium are you using and what lights the ph should be from 5.5 to 6.5 at the most i like my DWC at around 5.75 to a low 6 my girls love acidic condition as i have a root conditioner and root additives for increased stimuli for nute consumption. try getting dutch master zone to help your roos if that is the case

what is your res temp

Roots are looking great, no white residu, temp of waster is at 65, I lowered the PH, im at 5.7 right now.... I find that daily my PH raises any ideas why?

non here maybe from the nutes release the hormones of the plant mine did that through every growth spurt but once the growing stead out it gets better