well try letting them dry out a little in between watering I only water them once a day I use rapid rotters but they are the same concept. I was watering every 6 hours and they took upwards of 20 days went down to 2 and they were at about 10 with 1 I get them rooted in 7 or less. also to much humidity will cause fungas I have 2 1" hole drilled in my dome to allow some air in and open it up twice a day and let new air in.