I flushed a couple, but nowadays I usually put them in a jar of rubbing alcohol. One of my Loaches died the other day, and they STINK, and I couldn't get the jar open, and I didn't want the dead Loach smell on my hand, so I panicked and flung it out my window. My Bichir I buried. One of my Mosquitofish I fed to my old Slugs.