Yes 15 day old plants do not need nutes. With the soil mix you described you should be able to veg a month at least. Seedlings do not draw that much from the soil and the roots havent spread into the whole pot so the soil is still fertile. I didn't add any nutes til they were 5-6 weeks old. I started them on 1/4 strenght then slowly added til it was full strength by week 8. I've given flower nutes since they went into flower on March 10.
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