Effect of addition of red spinach leaf extract (Amaranthus tricolor L.) in feed against the level of color brightness of sword platy fish (Xiphophorus helleri)Adli Waliul Perdana, Siti Maulida and Rika IndrianiBIO Web Conf., 87 (2024) 03012DOI: https://doi.org/10.1051/bioconf/20248703012