Hello! I have been trying to root cuttings that I take off of my plants. I use a rooting gel that is supposed to help prevent damping off but its not working. I keep the plants under a humidity dome and they are planted in rockwool squares. The plants seem to just start taking hold and then one or two will damp off, the next thing i know everything surrounding the infected plants dies too. What causes damping off? How can I control it? Should I use a different medium to start the plants in? I appreciate your help !