I have not added any nutrients yet as its day 20 , they germinated on the 2nd of April and it's been 20 days , plenty of nutrients in soil coco mix , temp and humidity good and just added two additional fans today one outside and now 3 inside, extract fan timed 8 times a day to come on for 15 minutes , air intake and circulation fans on for 30 minutes every hour , 18 hours of light for now