Brown Streaks Week 5 Flower RDWC

Hey all. I am getting brown streaks on my middle and upper leaves starting about a week ago.
I am getting brown tips too, but I dont think I am overfeeding. Running a low ppm @ 550-650?
My PPM will drop for a day or two and then will rise the rest of the week. PH does the opposite.
I don't let my PH get above 6.2 or below 5.5
Can anyone help?
Tap water @ 80ppm
Armor Si 1.25ml/gal
CalMag 1.5ml/gal
GH Micro and Grow 1:2 Ratio.
About 14 inches under 2 315 LECs
All this gets me 650-700 PPM's (1.2-1.3 EC)
Started doing this back down at 500 PPMs (1.0EC) but I raised it thinking it may be cal or mag.

First, raise the lights. 22" minimum. Read the instructions. Not trying to insult but have you grown hydro before?

No insult. I have never grown anything before. To even harvest I would consider this a success, considering.
I already fixed the lights to the top pole of the tent with 1/2 EMT straps bolted to the light chassis.
I clipped fans blowing the heat away from the bulbs towards the exhaust, and a 6" duct is feeding outside air to the fans.
I underestimated just how fast these things were gonna grow. Veg was perfect.

5BY5LEC said:

No insult. I have never grown anything before. To even harvest I would consider this a success, considering.
I already fixed the lights to the top pole of the tent with 1/2 EMT straps bolted to the light chassis.
I clipped fans blowing the heat away from the bulbs towards the exhaust, and a 6" duct is feeding outside air to the fans.
I underestimated just how fast these things were gonna grow. Veg was perfect.

Click to expand...

First cal mag is far too low with water PPM that low. Use at least half the manufacturers recommendation.

Have you checked your roots? pH swings can indicate root problems. Your PPM is expected to drop as the plant takes the nutes up.

Check your roots.

The roots look good. I just washed up and checked. White and smell like a potato.
PPM's will drop quick after a res change. PH rises slow and stabilizes after a day.
But only for a few days. No matter what I add back to the res, plain water or nutes, the PPMs will start to rise and the PH will drop 6.0 - 5.0 in 24/hrs
They are consistent in always drinking around 2 1/2 gallons/ 24hrs for the last couple weeks though. I can change the res, but its just rinse repeat with the PPMs/PH after a few days.

Also, If I add extra Calmag my PPMs will go up before I mix in nutes. Do I add less nutes then to achieve the same 550 PPM, or just run a higher PPM due to the extra calmag?
Thanks for your help.

I changed my nutes back to the GH three part that I should have stayed with, and ran 2.0 of calmag per gal.
We will see what happens I suppose.

hotrodharley said:

First cal mag is far too low with water PPM that low. Use at least half the manufacturers recommendation.

Have you checked your roots? pH swings can indicate root problems. Your PPM is expected to drop as the plant takes the nutes up.

Check your roots.

Click to expand...

Hey Harley. You were right about the calmag. 200ppm calmag + 400ppm nutes has stopped any further progression of the striping. The buds seem to be growing faster as well.
Thanks man. Here they were last night. I am at about day 35. Its just two plants.