Intellitemp mats dold by big apple herps in new york packaged with their bah 1000. I use nothing but them for individual tanks. They maintain within 2 degrees, one stat can handle three mats. Very few people talk about them, but I would use nothing else. If you plug them straight in the plug they will NOT ever get higher than about 108 degrees which will not kill an animal. They have a great website with video tutorials and great customer service.