Do glofish get along with a blackskirt tetra?

Glofish are genetically altered DaniOS and they grow to about 1.5 inches long. They will mix well with most Tetras including the Blackskirt (Blackwidow) Tetras that grow to around 2.5 inches long. Just remember the golden rules. All tanks need a cycled filter and a weekly water change of around 50% and "1 inch of fish needs a minimum of 1 gallon of water" so that you don't overstock.