Okay everyone...

Its been a few days with virtually no nutes and the plants that are sick, seem to be getting sicker.. Some of the other plants are doing just fine, and a couple have a little yellow on them.

I upgraded my air pump and air stone today thinking it may be an oxygen problem... I doubt that, but it was cheap and worth a try.

I am starting to think it might be a nitrogen deficiency. But all the deficiencies look the same to me (untrained eye, still new to this).

I did get some hydrogen peroxide today, and was thinking about adding it to the water. I think i read somewhere that 8ml per gallon of water? Is this correct? Can I add it to the spray bottle and spray the roots directly? Will this harm the plants?

Attached are some updated pics. I know a couple are kinda blurry but there are a couple real clean pics to see exactly what the problem is.

I could really use some advice!!

Thanks in advance.