Good to have you here. 
Ah yes, that was easy now that I've read it properly.
I don't give them any nutes untill when you did aswell mate. I wait for the bottoms to go yellow first. Then I start at 200ppm ph5.7.
5.9 is perfectly fine though. Ph will rise naturally during veg so starting at 5.5-5.7 gives you the longest range before you need to bring it back down at 6.3-6.5
The only thing you're doing wrong is you're giving them bloom nutes.
They don't have much Nitrogen. The yellowing on the bottom leaves is Nitrogen deficiency, ( 'N' def) so the bloom nutes will give you a quick fix as they do have a little of it. But the other 2 things in it, prosperous (p) and potassium (k) are for bud building so they'll burn the leaves if you keep using them.
You'd be best to get the same brand of veg nutes just to avoid by complications.
That light is pretty wicked too so watch yourself. I've no idea what height it should be but it's just about right going from the picture. Top picture looks like some light bleaching but no other signs of the associated stress so id say you were like 8 Inches too close.
Raise it a foot maybe just to be safe.
Also, the title says dwc but that looks like a hydroton recirc/drip system?
And what is that collar looking thing around the plant?
No worries mate, I'm always happy to help out where I can.
A few guys spoon fed me for a while so it's nice to pass on the trade secrets.
It's what makes the world go round
Stay at 200ppm untill it starts dropping by 10ppm per day for a few days or the bottoms go yellow again. At least another 10-14 days.
Then go up to 300ppm untill that starts dropping.
Once the 300ppm feed is dropping by 10-20ppm per day go to 450ppm and you shouldn't need to go higher than that untill they hit the stretch.
If you get 20 a day drop at 450 go to 800, it will catch up soon enough.
In simple terms, just add on 50% nutes each time you get the 10-20ppm per day drop or you see yellow at the bottom.
If you feed like that, the ph will behave itself as best it can and you rarely if ever need to ph adjust it.
The ppm drop is directly related to many things but mostly it's the size of the root mass, which grows exponentially.
If you take the piss with high reservoir temps then that will throw it well off due to evaporation but I run mine at 25-27*c most of the time and never had any issues.
I don't even use a res cleaner anymore.
I should really tell you that it's essential to use something to keep the res clean.
Iether a sterilizing agent that kills all bacteria.
Or beneficial bacteria that will apparently do lots of lovely things but I've never used them tbh. See some crazy white, thick ass noodle root systems growing with them though.
Sterile is the easiest option as the chlorine in your tap water becomes a benefit
That would kill beneficial bacteria if you used them though.
You sound like me though mate. Just want an easy grow. That says sterile all the way.
If you can find sm-90 on eBay then get that. Even if it's diluted it wouldn't make a difference. A single 5ml dose on res change day will fix any root issues in an instant.
Most people use these things as a precautionary measure and that is 100% the right thing to do but worst case scenario you can run a few ml of bleach through a few times to kill any badness then just empty it straight back out and carry on
Empty the nutes every 7-10 days and you shouldn't ever get any problems
Happy days mate. That should be you all sorted then. If the mid growth starts to lose colour and go blotchy or you get little rusty spots appearing then that's your cue to hit the calmag.Oh I got the calmag on the shelf just in case and yeah I’m using tap water, the veg nutes are coming today
