Help please, 8 plants already dead, one left :(. yellowing or n def. or sumthin

[JD1stTimer]

I just can't believe this guy is using genetics instead of bagseed. Am I reading this thread correctly? Or is this a bagseed grow and somehow I didn't figure it out?

[420Somehow]

oxy-plus, is that hydrogen peroxide? stop using it if it is. stick with simple three part nutes and and cal-mag if not tap-water(which needs to be aged 1-2 days). do a few weeks and if growth comes back, which it's stressed so it may not grow for a few days, add one additional additive per week and track which are needed and helpful. just my prognosis for what it's worth.