Germination

I just started a hydroponics ebb and flow system..germinated my plants in paper towels then transferred to rock wool cubes when they popped.Put them under a 400 mh light 5 days ago.They are falling over but look good other than that.Why are they so weak and falling over?

they need water? They are stretched and you need to put a fan on them?

ok thanks,did that and they are looking better...Also had to adjust the ph