The Derasa Clam, Tridacna derasa, is a beautiful giant clam comprised of warm base colors and illuminating accents and are the most accessible and available giant clams in the home aquarium trade. Aquacultured Derasa Clams, like these species, are especially acculturated for the home aquarium and turn out to be exceptionally hardy. Coloration patterns range from blue, black, brown, gold, yellow, and white with accents. Derasa Clams will attach upon introduction to your tank. Therefore it is recommended that once attached that attachment is permanent. If the clam must be removed, though ill advised, it is best to take a razor blade and gently separate the clam's foot from the attachment point. They obtain nutrients through photosynthetic algae but will readily take direct feedings. Derasa Clams are the hardiest giant clam species suited for the home aquarium, and if proper tank conditions are met, they can grow up to 20 inches in captivity.