I have an African Clawed Frog who has been in quarantine for a couple of weeks now, with no use of his back legs. He has been convulsing, but now it is so much worse. He has been either seizing or something else for a few minutes now, and I have had to bring him to the surface for air. I have no idea what to do, no means with which to humanely euthanize him. What do I do????