Plants #1 and #2 are pretty beautifuls, with good growth, until end of the day the third leaves will be ready. At the day 10 the plant #3 showed two small burns on the leaves tips and at cotyledons. I don't know the exactly reason, but maybe I let the lamps (which I complete photoperiod) too much close to plant #3. Despite that, third leave will also be ready until the end of the day. Cheers from Brazil!