I also have a few in a bucket - collecting dust. I never had a problem after years of use. After reading of a few fried tanks, I pulled all mine, and replaced them a few years ago. I think they changed designs, so, I'm not sure if a new one has the same hazards as the old ones. I personally won't use them in my tanks, or ever buy one again, unless more than 1 person can prove otherwise that they are fixed, and have years of proof. Just my opinion, I wouldn't use them.