Are you using a dome or cover that may create too much humidity? I think rapid rooters are great. Usually when everything is totally purple it is an indication of too high humidity. You see it a lot in the areo fog systems. The rooter's are normally sitting in 1/4 inch of water on my rig and with the dome on the seed house the humidity is goofy high so I remove the cover twice daily to get fresh air. Good Luck!!