We’ve seen plenty of animals aided by human ingenuity lately: “Flipper,” a cat who lucked into a sweet set of wheels, and ” Chris P. Bacon,” the piglet given a new lease on life with K’Nex toys, rank pretty high on the cute list. But, as it turns out, we hadn’t seen anything yet. Enter this goldfish. The fish has trouble staying afloat, so her owner — apparently an aquatic MacGyver — fashioned her a homemade, floating harness.