DM gold ph

i was wondering if other dm gold users are ph-ing their reservoirs to 5.5 per the instructions. i ask because thats what im doing and my seedlings are yellowing. theyre about 2 1/2 weeks old and my nutes are around 300 ppm. not sure if i should raise the ph a little.
they seem healthy otherwise...

you should let your ph swing some before adjusting

I like to set mine around 5.8 and let it swing as far as 6.5 before I bring it back down but I also would let it drop as low as 5.4 or so

If its just sitting at 5.5 the whole time that could be a bit to acidic for them depending on your food and the strain and so on

If there coming up to 3 weeks you could try feeding a tiny bit more N but I`d try to stay below 500-600ppm till their 4 to 6 weeks old but I quite often find that I can push to around 700 - 800ppm with my tap water that comes in around 200 to 400ppm, are you using tap water or RO`d ?

ive been letting it swing to 6.2-6.3 and last night i mixed up fresh nutes and went a little stronger. i havent fed them any yet cuz its my first time working with rockwool and i think i let the pots get too wet so i was gonna let them dry out for awhile first. thanks for the reply

Have u had to supplement cal/mg with these nutes?

RO water btw. What I mixed last night ended up around 560ppm