I dont know. I ordered last night. The box showed up at 1:00 pm. took it right to the tank to float for 15-20 min. Way too late for one he look like he was dead for a while. The other looks like he has red blotches on his body, if I had to guess I would think ammonia burns or burns of some sort. The water was nice and warm. This is my first time mail ordering so I dont know what to think.