Less is more, you dont need aquarium heaters. I place my spawn next to my central heating, its always just under 30 degrees C over there. After my cakes are done I put them in my room, room temperature is just fine for shrooms and the day-night change of temperature is also not harmful. As for pics on the forum, cant we just post a link?
http://24.media.tumblr.com/tumblr_ljlyfayAdT1qb68jko1_500.jpg
but you can even upload to mediamatic
http://www.mediamatic.net/245647/en/teddy-shroom