Really shot up this week. One seems to be having a problem. This is day 8 from seed. I just fed at quarter strength last night they took it well. Over 15 hours no sign of nutrient burn. Two 600 watt 265 volt China cob leds for right now. I'll turn on an 800 watt led in another two weeks or so. Any tips appreciated. First time with an auto and something that wasn't bag seed.