Hey Opie! I had the same rot problem in my small closet grow w/8 Lowlife autoflowers. I went to change my res and it was nasty, luckily I caught it before too much damage was done and all roots were still looking healthy and I only had to kill one seedling. I am pretty sure it was a air circulation issue, and I am keeping the doors open at night for now. The Lowlifes are on 20/4. I germed my last 3 female seeds from my last order (1 Nirvana Snow White, 1 Paradise Seeds Ice Cream, and that last Church seed). I am hoping to get a good mother to reveg after harvest for cloning. I have 10 G13 Power Skunk seeds and 5 G13 Ice seeds that I got for free. From now on I am going to just buy regular seeds. No more feminized seeds until I perfect my growing techniques. I get my cloning system delivered tomorrow and my homebox grow tent. And I will get my root treatment stuff in a few days. And my 2 extra air stones will be here in 2-3 days.
Right now in my small closet I have a new 105 watt multispectrum light with 6,900 lumens, a 65 watt bloom light wth 3,400 lumens, and a 85 watt veg light with 4,200 lumens. In 3 weeks or so, I will change to a blooming set up with a 50 watt veg light with 3,400 lumens, the 105 watt light with 6,900 lumens, and 3 85 watt bloom lights with 12,600 lumens. I think that will be enough for bud development. Am I keeping my wattage in reasonable range for stealth reasons? In my bigger closet I will be vegging seedlings, in my two other hydro setups(the 3 female seeds, 4 Power Skunk and 4 Ice seeds). For that I will another 105 watt light with 6,900 lumens, a 50 watt veg light with 3,400 lumens, a 65 watt veg light with 3,400 lumens, an 85 watt veg light with 4,200 lumens, and a 65 watt bloom light with 3,400 lumens.
This will be fun and interesting for me! Growing is a blast! I should be bummed about the seedlings I have destroyed, but that knowledge is invaluable! Thanks to all 4 helping me.