I am a new grower. I got brown spots on the leaves of seedlings with the fogger. I used a rubbermaid container with 1/2" hose to pipe the mist from the humidifier to the root zone. My plants are seedlings. I adjusted my ph, used r/o water and am using GH 3 part nutrients. I used net pots and clay pellets. I bought a ultrasonic humidifier from Walmart ($30). I ran the humidifier only during the day.

Zandor, you are a great wizard. Thank you for all your help.