Seedlings have some kind of deficiency

Hey guys

So I am a newb at growing and can't seem to get this thing going for some reason I am getting some kind of defficencies and I think a little nute burn. I just flushed all the plants with A ph of 5.7 and the final run off of 300 PPM. I am at a Loss as to what's going on with my little gals. Info below

Medium: botanicare ready gro coco amended with mykos, and azos, xtreme gardening (washed it with a PH of 6.0)
Stage: 3rd week from seed
Nutes: GH 3 part, super thrive, cal mag, liquid karma, bio roots, power silicate, azomax, and hygrozyme
PPM: 427
PH: 5.7
Lighting: 2ft 4bulb T5, about 4-5 inches away from plants
Temps: 75° F

Pics below, if you look closely some of the leaf tips are curling up and burnt.

You're throwing a lot of shit at it while it's so young.
If this was your first grow, IMO, you would have had a lot easier time starting off in soil, but anyways.........
See if you can't get your PH up just a little.
It does look hungry, but until you rule out a lockout, I wouldn't increase your nute strength just yet.

You think I should flush completely and the just do the 3part GH?

Maybe it's light deficiency. It might do better under a different light, or outdoors. I think the fertilizer could be making it worse. The light isn't really enough to flower under.