yellow and white discoloraTION?

[DroMan23]

hi everybody

i have a dwc with 9 plants, and im having problems i cant fgure out with 2 of them. There vegging almost 4 weeks old, ive been fighting with my ph it wont lower its been at about 6.5-7, and about 6 of my plants just got over a manganese deficienncy.
Anyway with about 2 of my plants i noticed today that the lower leaves are yellowing a bit and turning white :S ive checked thru the sick plant guide i got from a link on here and on the grow problem solver on nirvanas website all i can guess is its a iron deficiency but my plants dont look anything like the pics shown for it.

confused man, its more white than anything rite in the middle of the leaf, i think spreading to the tip and its browning a bit in the middle of the white....

aany diagnosis plz help me these deficiencys are pissing me off!!
,aybe i need to try new nutes.

one mroe questions my previous manganese def i think is coming back a bit whats a safe time period to foliar feed like every 3-4 days til its gone or....?

[DroMan23]

oh good god i was reasing up on why some of my lower leaves had discoloration n i read up on root rot, thought fuck i would kill myself if i had that .... got curious and took my babies out look in there to check my water levels and there it was....

very very minor, there was a bit of orang rite on the a bunch of taproots comin out of one of my beauties, and small hints of pale orange on a few other taproots....

fuck i hadda feeling this would happen, its been hot as hell in my grow area (87-91) its been hard to keep the temps stable, rite now im putting tin foil on the top of my res dunno why i didnt before i seen so many pics on here with it done, and gunna get me a thrm for the res water....

damnit man ok so how do i go about curing the root rot??? i read hydrogen peroxide?? so move my roots into seperate container rinse them in hydrogen peroxide for how llong?? then obviously clean my res and put back.... or could i jus add the hydrogen peroxide to my res????

[Anony]

Lower leaf discoloration does not automatically mean root rot. There are many causes. Post more information for a more accurate response.
Do not use foil.

[DroMan23]

i kno that i said there is orange on some of my roots in my res, its very minor i read to use hydrogen peroxide where could i get that, isnt that rubbing alchohol or ???
Do i put the hydrogen peroxide in my res or do i take out the roots and dip them in or let them soak plz someone help me save my crop

[Help_Needed]

The FIRST think you've got to do is get that pH down. The nute deficiencies are most likely caused by pH lockout.

What are you doing to try to lower it?

[DroMan23]

im using ph down to try n lower it, i have nutes in the water at half strength and a hydroponic nutrient i put in to fix my manganese def, very very small dose of that little next to nothing...mostly foliar fed it.

but ye yesterday i added about 6 drops 2 at a time, bout hour n half apart, and there was no change what so ever. Figured id wake up today n see a change cuz maybe it dint mix anough, but no change at all ph still the same i have the indicator drops so im guessing the ph is around 6.8-7 according to the chart...

my main concern rite now is i think i have very minor root rot, i saw orange hues on some roots in my res, what exactly do i do to solve this.

[DroMan23]

by the way help_needed i read ure ENTIRE grow journal ure first grow last nite, u did a amazing job man mad props u gave me alot of ideas for the near future when i get a new place

[DroMan23]

k i added some more ph down last nite den went n passed out, today after work i checked it n its at a solid 6 but now i need to deal with the root rot plz i need someone to help me!!!!!!!!