The Coney Grouper is deep red in color with green spots on its head and body. These fish are very hardy and will do very well in a fish-only aquarium. They should not be kept with fish they can fit in their mouths.Groupers come from a family of fish known as Sea Bass. These fish have stout bodies with large mouths filled with more than one set of teeth. Groupers use powerful suction to engulf their prey by quickly opening their mouths. Their prey is swallowed whole instead of being chewed.