josh would probably be able to tell you better. From my understanding he had gotten some rock from someone and had left it sitting in a cooler with no circulation or heater since the person said there was nothing on it he didn't think it would be a big deal. When he took it out of the container and put it into the tank he had powerheads blasting on it and water was splashing and as the water evaporates it released the toxins. They had fallen asleep and woke up with muscle stiffness, it was hard to breathe and coughing, his oxygen was low, bp was through the roof, shakes, delirious.