Fish make great pets because they do not require a litter box, walking, or matching human-pet outfits. Find a fuss-free friend with today's Groupon: for $10, you get $25 worth of fish and accessories at Fish Gallery in Houston.

Named Best Aquarium Supply 2010 by the Houston Press, Fish Gallery provides a plethora of sea-bound critters as well as the accouterments to create an aboveground abode for them. Its stalwart staff guides pescaphiles in the selection and care of freshwater and saltwater creatures. On the freshwater side, bettas enjoy the solitary life ($3.99 each), and neon tetras turn tanks into techno-dance parties ($3.49 each, $30 for 10). The percula clown fish somersaults in saltwater ($29), swimming circles around the illustrious coral beauty fish ($25). Fish friends create water-filled wigwams, making their new swimmers feel right at home with plant decorations that can also be used as disguises during underwater chase scenes ($7.99+).

Today's Groupon can also be used toward aquariums ($150+, $1000+ for custom, $15–$40 for kids' aquariums), equipment ($50–$250), and supplies ($5–$20). Human guppies can help their full-size counterparts pick out pieces before indulging in touch tanks and kid-centric programs.