Plant issue with top feed hydro setup, leaves dying

[tttt]

Hi people, Im in my first hydro grow. My plants is about 20 days old and for several days leaves are aways drooping, growth is much slower. One of the leaves is dead already and the other are starting to die as well, starting from bottom to top. Using full RO water. Water ph is 5.8-6.1, water temp is between 18~22 Celsius. Did one feed with Advances Nutrient Ph perfect Micro,Grow,Bloom ( 1 ml/l ) + Additives ( Bud Candy, Voodoo Juice, Rhyno Skin, B-52, Sensizym, CalMag - all 0.5 ml/l ). When mixed the nutrients ppm was 750. Now for several days im correcting every day with ph down and ppm has become 1200.
Here are some pics if it helps. Please if anyone knows what might be it to share.

 

[chemistry]

Check your roots for root rot.

 

[StevetheGrower]

Hello.. If i were you at this stage of the plant i could give once a week base nuts 1ml per liter one feed ,next feed will be rhino with some cal mag,next some b52.. i want to say that i dont think its good idea to mix so many different meals at once plus *1200ppm it sounds me 2 much at this stage., its like you are going to eat at once some burgers some pasta pizza chocolate icecream.....Thats my opinion maybe i am wrong.

I mean *750ppm

 

[HighVoltageSparky]

Hey bud, plants recovered ? 2 Things here
-NEVER use ph adjusters with ph perfect technology from Advancet Nutrients. Even ph adjusters from AN.
-Add full measure of additives, adjust with base nutrients *0.5ml, 1ml etc. No more screwing around than this. Their words, not mine. Everything's working perfectly i just did this in my grows.
And Calmag? Is this in their feed schedule?

And please use EC, not ppm as there are different scales out there