did it end before it even started..??

My three week old, og kush strain i have in three gallon dwc tub with one pump and two air stones. i havent had a way to get flora nutes right away so i went to my local home depot and got concentrate schultz 10-15-10 plant food plus and it says liquid plant food, feeds all indoor and outdoor plants and it list all the indoor plants and at the end says hydroponics so im guessing it was okay. it says seven drops per quart of water. did i mess up my og kush strain??? i just dont feel comfortable about it but i need to do it because the leafs were turning yellow and the stems were purple because i had nothing but water and air and of course theres no nutes in that, any feed back would help alot thanks... here is a link i found for the nute i put in the schultz 10-15-10 plant food plus.http://www.cdfa.ca.gov/egov/is/fert/fert2.asp?ID=7609 any help would be really helpfull thanks.
 
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