When I finally got William out of bed this afternoon, we ran the same errands as yesterday but with more success. We picked up his record player. Apparently the speed control is a strange magnet disc with a second disc that rotates against it that likely contains a series of magnets. We also bought a new fish, a mottled goldfish William named "Gilligan". Only once we put it in the tank did I realize that it blends perfectly into the bottom rocks we have. Perhaps I should swap out the rocks.