HELP!!!!! leaves getting copper brown/yellow spots on them,in an aerogrow

Im currently using a aerogrow classic,i have 2 gunja plants in there along with some garlic and oregano,1 gunja plant is slowly getting yellow/copper coloured spots on the leaves,slowly drying out,please help with this.i dont know what setting to put the aerogrow on (saladgreens or herbs) ect.the leaves are yellow as well,btween the veins,is that a lack of something?.Iv put the two tablets in that came with the herb kit.is that ok? or is that whats killing my gunja? also using tap water.here are 2 pics of it,please help if you can.
also when to reset the cycles if anyone knows.
Attached Thumbnails

Nute burn + ph imbalance

Flush the res, ph it to ~6 and add 1/5 strength nutes, but make sure the ph is no lower than 5.5 after nutes

Will help

ya, its lookin like...somethin, not nute burn tho, like nitrogen def or somethin like ph being off. or like..idk, it just seems like nitrogen cuz the plants yellowing, meaning its suckin up all the nitrogen from the leaves to keep itself alive.

thanks, iv left it 4 a few days,threw in a few pellets of rose fert and it's fully come back to life,greening up and growing again,so is everything else.i mite just let it do its thing 4 a few days.see if it pulls through,haha