Poor Nathan's frog bit the dust.
I think he may have drowned. He normally would be sitting in a dry portion of the tank, or near his frog food....but this morning he was floating at the bottom of the tank under water. We have witnessed him swim before, so we know he can do it---but Nathan would also give him a little push up onto land when he seemed tired. Maybe this time, he needed a little shove and no one was there for him. :0(
At least we got to see him change into his froggie form. Sadly, he was only a frog for a few days....after months of tadpole living.