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If you over nuted it take a break for a week or two dont feed them nutes until they rcover about a week give em two weeks to be sure then when you start to flow in the nutes dilute the strength and give em less nutes until they get bigger 6.4 is just about right youll be fine send me a pic so I can see this yellowing your talkin bout. It could be nitrogen deficiant.

It could be signs of a Ph problem or it could be pests. uhhnmmm 6.0 is a little to acidic for hydrro use distilled water it is the right ph. Or other wise aim for 6.2-7.0

MAke sure you have oxygen in the water when feed or anything roots need oxygen for good root growth. Move the lights closer3-5 inches from the plant to slow stretching and if you can move the lights down try to move the plants up prop somethin under the system if you can....Tacos huh It could be lack of oxygen or over feed dont usually go by what the package say it is usually too strong for a marijuana plant especially a small seedlinng try 1/4 strength and if that is what u are doin feed only20 mins try to find some way to limit feed if over feeding is the problem and if your plant is aboout to die go get some superthrive and a a drop (per gallon) to the water helps sort of revive the plant with helpful horemones and stimulants cause it doesnt have any nutes in it you can add it right in to you feeding tank or watering tank.

hey man just start with what canna recommends at first...do a whole run like that....then after you get the hang of things you can start uping the dosage of each part until your plant shows sighns of burn...then back it down just a bit and that will be the best strength for your girls