I think it would probably start to decay. I mean, don't take it to the bank or anything, since I've never tried it, but I'm thinking in terms of jerky. If you set it in water, even though it's been dehydrated and dried out for a long time, it still soaks up the water. I'm not sure if it would harm the tank, i.e. an ammonia spike, but I'm pretty sure it would start looking like poo after a couple of days. I think the chance of it spiking the tank would keep me from adding one myself. Besides, no one knows what kind of chemicals it encountered. You could superglue it to the doors on your stand...like a doorknob though