Tridacna Derasa Clams are a great addition to any large marine aquarium. They are one of the largest clams in the Tridacna family and can grow in excess of 2 feet. Their lighting needs are fairly simple. They will do well under metal halides or LED lighting. Derasa clams are rather hearty and a great starter clam for anyone with a large established aquarium. Should you have any questions please contact us.