Hey there, I just came home and one of my daughters gold fish is floating upside down, he is still alive but as soon as he stops swimming around he turns upside down and floats to the top of the bowl, when he starts swimming again he turns right way up! Has his swim bladder or whatever you call it been busted, can he survive like this or should I put him out of his misery. Can I fix him? What is the best way to put down a gold fish? Flushing him seems like a really horrible way to go. What caused him to get like this and will it happen to my other fish?