I have been keeping 3 American toads for the last month and a half. They are about an inch big, so I've been feeding them flightless fruit flies everyday. They all seemed fine until today, when I went to feed them and found one of them stiff and not moving. She had been just fine yesterday, no trouble eating or anything. I'm wondering what I've done wrong/how I can prevent this from happening to the other two. I just moved a few days ago, could this have caused it?