Kush plants need help! Pics

I currently am growing 4 plants in a homebox tent, using CNS 17 Grow, Seaplex, and Humex. A few days ago i did my first res change, and tried my ppm at 550, the Ph was about 6.2 after adjustments. The next day when checking my plants I noticed browning along the edges and tips, pretty bad. I immediately lowered the PPM to 330, i did this by dilluting it with some Ph balanced RO water. The browning has now slowed down and hopefully will stop soon, i'm assuming nute burn? The link to my steup with pics is here...
https://www.rollitup.org/dwc-bubbleponics/295727-first-grow-pic.html
I also noticed a small amount of algae on the hydrton and i believe that's just due to my drippers being on 24/7, i plan to switch them to only be on for 30 min at a time 5 min a day. I had them on 24/7 to promote quick root growth in my clones for the first few weeks until the roots get in the water. I read that i can use hydrogen peroxide to get rid of the algae.
Below are pics of the damage, i was going to flush with water for a week, and then go back to the nutes being much more careful.





THANKS!

Hope this helps...

https://www.rollitup.org/marijuana-plant-problems/216537-self-diagnose-your-plants.html

all the organic material will be eaten by hydrogen peroxide and yes that is nutrient burn and flushing for a week would be a good thing maybe get some gognats for the future so you don't get anything in your clay pebbles and start at 75% of what you left on before the burn

PH has to be 5.5 for hydro...that's the first mistake.

i no but it moves alot, i try to keep it there. Already read it before i thought good pics may help.

Other then the problems...they look nice...what strain?

Maybe since the ph is 6.5 potassium is getting locked out? 2 green cracks, 1 bluberry, 1 black domina theres a link to the setup with details and pics above.

MMM green crack...love that shit...i would love to get my hands on a clone or some seeds.

Ya hydro grows are alot more tedious, the tollerence of PH isn't as great as with soil, (which is why i use soil), the PH must be kept between 5.4-5.6, for some reason it's what works the best, i would assume that the high PH is a direct cause of your problems.