Florida flag fish Jordanella floridae if memory serves. It is native to Florida and the male has lines of red scales resembling the stripes of the American Flag. They are most famed for their appetite for hair algae. They can be very territorial, especially in smaller tanks. He started nipping other fish in my 20 gal
, so he is now in half of my fry/qt
tank. They are less aggressive if they have more space and a few females. Mine only picked on smaller fish.