I just recieved a hipoppus clam today from coralsandbar. It looks cool. its my first clam and I chose it because it is one of the lower light clams and I have pc lighting on my tank. anyways it has purple dots going along the edges of it. Should I try to put a rock under it or is the substrate(aragonite) just fine? It opened up today with no problems. also when the mouth is open does that mean it is hungry or that it could be stressed from an overnight trip? It not as pretty as everyone maximas but I still think its a pretty clam =].