And also the thing about bugs and deseases it's always about poor airflow around the plants and on the plants ex: over crowed grow room with no space between plants. One thing bugs and mold hate is wind. so make sure the bottom of the plants are well ventilated. Usually shit starts from the ground up. And humidity control is very important ,mold and bacteria thrive in enclosed humid badly vented spaces, if your using hydroponics high humidity will become an issue fast . If your not growing mushrooms, you should avoid having that in your grow room. A good example of what happens when you dont respect that rule is included in . Volume 01. 15 Pounds In 80 Days .