I have been doing fodder in my house for 4 weeks now and have had great success. I had one tray get some mold in the root base because I left it sitting for 2 weeks but, I cut off the grass on the top and threw away the rest and my chickens had it gobble up in minutes. I grow mine in takeout containers (just because they were available and easy to deal with) I didn't put any holes in the bottom just made sure to rinse them daily. I am getting ready to incorporate more permanent containers but, for now, these work just fine. I tried on the batch that I started yesterday to soak them in 1tsp bleach to 1 gal water to see if it changes any outcomes. I know fodder is extra work but, it make a lot of financial sense and it doesn't take that much time. For the chickens that are in breeding pens with no immediate daily run this make them very happy.