i saw those guys too, and did a little research and found out that it's red because in it's native habitat, it hides under water lilies where the underside are red so it's a natural camo. Need a large tank, but it's not that agressive because the mouth opens wide but only act as a suction and i saw those guys actually getting picked on by the red parrots they are with. 29 dollars for one though, kind of expensive for me right now.