Nute def or nute burn?

Hydro... 4 plants from seed (bubbalicious, master kush from nirvana)
600 watt MH at aprx 20 inches from canopy 24hr.
ph 5.8-6.0
weekly- AN - 1oz each micro/grow/bloom, 1/2 oz each voodoo juice and b-52
10gal reservoir - 2 airstones
70-76 degree weather been iffy.

Week 3 veg
Everything looked solid till today than i notice these leaves. Used a scope no bugs. All stems green. Good white roots.

Too many nutes? Bugs? Never seen the black and purple in the yellow before.or do I have a nute deficiency? The search yeilded too many varying results.

slight nute burn IMO bro back done on them see if this resolves problem

Back off the nutes a touch.

Update...

Did a flush, changed nute formula to reduce n and add more micro. Seemed to solve the main issue. Seemed to recover ok. Just now showing preflowers. So far all look female but still scoping for balls.