I have this problem right now in 2 of my plants. They are not yet placed in a pot, they re still in party cups. They are 6 days old. I am using a 40 W Daylight E14 SES daylight which is on for 24/7 and I water them in a period of 3 days. Why is this problem happening they should obviosly open the 4 leaves by now but they are not obvious now... Thanks for any advice..