What are Glofish?
GloFish are zebra danios that have been genetically modified to glow under blacklight. In normal light they are flourescent shades of red, green, and yellow. Apart from the different coloring, they are otherwise identical to zebra danios.
Please note that these aren't "painted fish." Painted fish are typically glassfish that have been injected with dye, and the process is traumatizing to the fish. In the case of glofish, a gene was injected into a fertilized danio egg, and the fish were bred from that first glofish. The live fish aren't harmed in any way.You can learn more about GloFish here. Generally they are $4-10/each, which is more than a typical zebra danio (generally $0.99-$2/each).