One of my Neon Tetras is floating at the top of the aquarium, still alive, but he's turning white in his midsection. Oh, God, the filter water just hit him and sent him to the bottom. He acts paralyzed, and is now floating back to the top. I just took him out and put him in a glass with tank water. He's definately not going to live. Anyone recognize the symptoms? All the other fish are fine. The tetras were picked on (tail fins nipped) when I put them in last week, but they have hiding spots to get away, and all seemed fine. I have a couple each of strawberry tetras, zebra danios, platys, serpae tetras, and painted swordtails. Plus several neons. All the fish are small. Thanks for any suggestions. Also, I have to put this little guy out of his misery. Humanely. I heard vodka in the water? He's floating upside down, still barely hanging on. I don't want to do it!