Today’s featured promo on MacUpdate offers Goldfish Aquarium for US$9.95 (50% off, retail $19.95). “Goldfish Aquarium demonstrates the latest technology of virtual fish tanks on your Mac. It features dynamic backgrounds, realistic fish movement, amazing animation are the latest enhancements to this visually stunning line of Entertainment Software.” Goldfish Aquarium 2 requires Mac OS X 10.4 or later.