flagfish

The flagfish or American flagfish (Jordanella floridae) is a pupfish native to Florida. It received its name because the male fish resembles the American flag, with a large black/blue dot and alternating red and black/blue stripes on its body. It is a common, native fish in Florida that is occasionally found in fish stores. They make quick work of hair algae and they may also eat plants in a planted aquarium https://en.wikipedia.org/wiki/Flagfish