Frist indoor grow - Northern Light Auto

So, a lot has happened meanwhile. They seem to be growing fairly well. Gave them their first feed on the third day of the second week. The stronger plant seemed to have no problems with it, while the other on seems to have suffered from nutrient burn. Could be because of getting feed directly onto leaves, but the next feed to the weaker plant will be plain water nevertheless. Also the temps are a bit too high right now because I seemed to get a faulty speed controller for the proper exhaust fan. I will be getting a new one ASAP tho, which will hopefully fix that problem. Humidity is also too low, but this i cannot seem to control because humidifier is a bit out of the reach atm. Also nodes seem a bit too close to one another, but I don't think that the light is too low.