DWC first time grow feedback

Hey guys just looking for a bit of feedback on growth these are auto afghan kush germinated on 1st of june. First set of true leaves im aware are in bad shape as had a lock out which was rectified straight away anything else that looks suspicious is because theyve just had a spraying of dr schimmel in the 4 hours darkness so its reflection. Just looking for some feedback on their development they are in a 20/4 atm on a 600w bulb set on 400w for now. Feeding canna aqua, calmag & rhizotonic. Im feeding as to how they react rather than the feed guide which seems to be going on. All roots bright white and strong. They are on day 28 from popping seed.

 

Forgot to mention ive topped 2 and left 2 alone