first crocea clam

[isaac1]

hi guys i have recently purchesed a clam he looks like he has taken well to my tank he has attatched himself to the rock i placed him on and is realy responsive to movement and shadows, my only concern is i no little about clams and he has strange markings on his mantle the look almost brown and and circle his entire mantle im not sure if it its somthing i should be concernd about or not but any one who has extensive knowledge with clams or owns them aswell your feed back will be greatly appreceaited

isaac