Brown Spots First Grow Got Pics AHHHHHHH!

[smitty750]

SETUP:

5 18 gallon plastic bins DWC with 2 plants ea except 1 bucket has just 1 plant. Plants sprouted on 1/24/07 and all plants have a minimum of 4-5 lg nodes.
Room temp is 70-80f
Water Temp is 67f
PH range is 5.6-6.2
PPM is 215
RH 45-55%
Lights are 18-6 600 watt MH conversion 24" above top of tallest plant
RODI water
GH 3 part flora series nutes

Most of the plants are doing good I have 5 Greenhouse Seed Co. Lemon Skunk. 3 Paradise Seed Co. Amsterdam Flame. And 1 Bagseed. The Lemons and the Flames are kept seperate and in theyre own bins. The same with the bagseed. Now my problem is this, This is the bagseed

 

[smitty750]

Sorry these are all of the bagseed

 

[smitty750]

These are of the Lemon Skunk

 

[smitty750]

And these are of the Amsterdam Flame

 

[smitty750]

Can someone please tell me what Im doing wrong????

 

[Morgosverlo]

Dude I have just about the same setup as you. I had the same problem you can check out my threads on sick plants "nute burn" look for my user name..

Anyway I think it might be to soon for nutes, I would flush with pure H20 for a bit. Then slowly reintroduce the nutes. I am also using the 3 part GH and since my flush and easing up on the nutes its looking good.

 

[Morgosverlo]

My freaking out starts on page 3 "Sick Plants Need Help"

 

[smitty750]

I added 1/4 teaspoon per gallon of Epsom Salt to my DWC thinking its a magnesium def. How long should it take until I notice a difference you think? And am I right in my assumption of it being a a MAG Def or no?

 

[smitty750]

Update as of 10 minutes ago

Bagseed is 1st 2 pics than the next 5 are Paradise seed Co. Amsterdam Flame

The last2 are Greenhouse Seed Co. Lemon Skunk All PH is 6.0 Tds is 350ish
Im starting to think its a MN Def not a MG Def?

 

[Old Bud]

Go to www.ganjaguerrilla.net for a good guide with lots of pics of various deficiencies and diseases. Everything is there in one place.

 

[trillions of atoms]

try dropping the ph some adding the mg wait a couple days and see if it clears, if not hen could be something else

 

[smitty750]

Thanks guys for the help. So is it a constant game of raising and lowering PH to make available diff nutes and elements, or is keeping a PH range instead of a PH point better? Also Trillions what PH would you recommend? Old bud thanks for the site lots of usefull info, Gracias my friend!