I use test strips Thyra, the next morning i went out, didnt get back til evening from school. When i got back, Alaric was dead, tested water and Amonia had went through the roof, the evening before, it wasnt bad, so i of course didnt expect anything. Even if i had did a water change, the snail being left in there would have continued to excel Amonia levels until i removed it. I need to be more careful from now on with snails.