Hi Kris and Adam

I use this type of greenhouse as my fruiting chamber and it works really well. I keep it in the garage and use an humidifier as I live in Canberra, Australia and the air is often really dry. The humidifier holds a bit over 5L of water so I only need to fill it once a week. I have the humidifier at the bottom of the greenhouse and have cut a hole in the top to encourage airflow and prevent CO2 build up.

I did the course run by the guy in the link you shared above, Adam. He has a Facebook group for people who have done the course which is more user friendly than the format of this forum, and they are still able to limit membership to those who have done the course. Might be something to consider for the future.
Alison

Is there a minimum amount you should put in a bag? My bags look about the same size as those in the video, but I only have 180g of spawn so I was thinking of using just 1kg of coffee. Will this work?