Brown spots on fan leaves - Photo

[Paramecij]

Strain: Auto Think Different
# of plants: 1
Grow type: Hydro
Grow stage: Grow 18 days
Setup: DWC
Light: Led 300w ... Actual wattage 150w
Nutrients: General Hydroponics
Medium: Rockwool and Hydroton
PPM: 250 ppm Cal-Mag + Micro, Grow and Bloom 270 ppm Total: 520 ppm.
PH: 5,6-6,2
RH: 50%
Room temp: 71,6 - 77,0
Solution temp: 65
Pests: none known

Hey guys, i need some help with my first grow in DWC. I have problems with brown spots on fan leaves and i dont know the reason for them. Sorry for my english... It is not perfect but i am trying ;-)
If you have any ideas please help me.

Thanks...

 

[The Germinator]

Hard to tell under purple lights. My guess is splash.

 

[Paramecij]

Thanks for reply, i will add some photos later under daylight. It is night time at the monent so i don't want to disturb her.
So you think ther is nothing to worry about?

 

[Paramecij]

Here are some photos taken today. I gues it is nothing serious, but any advice is welcome becouse it is my first hydro grow and i would like to learn as much as possible.

What do you think, how she looks?

 

[PvP Goddess]

Hey there,

See that "eagle claw" that's happening? It's where the tips of your fan leaves bend straight down, that's a sign of Nitrogen Toxicity. Those spots could be a PH imbalance or a nutrient deficiency. What is your current PH and PPM in your reservoir?

 

[Paramecij]

Hey,

Ph today was at 6,2 and i bring it down to 5,8. PPM is 520. I am using GH 3 part series nutrients 3 ml of each per 5 liters of RO water. I start with with RO water and cal mag to 250 ppm (to high?) and then nutrients to total 520ppm.

Thanks for helping me out :-D

 

[PvP Goddess]

That is the right PPH and PPM for a plant in veg. You're welcome.

 

[The Germinator]

Spots happen. Does look like nitrogen tox though.

 

[Paramecij]

Would you suggest to drop calmag to 150-170 ppm and add only micro and bloom to 400ppm, total of 550ppm? Will this help her with nitrogen tox?