PPM and PH going down, Not Root Rot please help

hey everyone, im doing a 5 gallon dwc northern lights grow. Nutes are GH line with dutch master gold zone and calimagic. It seems that my ph keeps going down along with my ppm. I have to keep adding ph up to get it to 5.8. Anyone know whats going on? I have read some places that I should raise my ppm while others say to lower ppm. One theory is that N and K are being used to much while leaving behind the acidic P which lowers ph. Im 5 weeks into flower can anyone tell me what I should do to stabilize the ph more. Is it ok for it to keep going down? should I add more or less PK. Please help.

I am starting my own grow.
From my read, and my learning.

It sounds like you need to add more nutrients. If the PH Goes UP and the PPM goes down. You need more nutrients.

Uhhhhhh, I wouldnt add any more nutes. If anything, remove the additives and just use the HG nutes. See if that stabalizes better. Alot of times when you use additives, it creates those kinda problems. What is the ph when you make your res?

Please list nute brand, ppm of nutes, and water PH before adding nutes.

what kind of water are you using. many sources of tap water contain metals that alter ph. try using R/O water if you aren't now.

the above posters are right on the money here.

before i did my first DWC grow i did alot of research.
i bought some CAL/MAG..some GH Flora Nova Grow/Bloom nutes..1 bottle of grow and one bottle of bloom nutes(Keep It Simple Stoner concept)..some Bud Candy..only flowering additive i used,and some ph up/down.

i also invested in a RO system..cuz the ppm of my well water was around 1300ppm(ouch)

during veg state i checked my ppms and ph daily..my ph would rise and my ppms would fall,and i topped daily with just RO water..after one week i did a rez change and upping my ppms..i did this for 4 weeks.

then i switched to flowering..cuz i had a monster plant!

starting from around week 3 i saw my ph and ppms dropping..no root rot or algea or anything funky in my rez..the water temps stayed around 68F..which i think is critical.

and i am smoking on some amazing buds atm.

i say if she looks healthy and no issues per say..just ride it out.

just keep adding ph up.

i only checked my ph and ppms once per day ,and it was just after i woke up.