I am very sorry to hear that too. In every group, there is at least one or two that fail to thrive or just die for no apparent reason. Usually this is ascribed to genetic factors or nutritional issues during the tadpole phase. Doesn't make the loss any easier, though! Every so often, though, there are runts who do make it and that's why we keep on trying with these little guys... Keep up the good work - I (for one) think you are doing a great job with your toads!