I purchased the Crocea Clam at Alamo aquatics a while back. He was under priced so I jumped on it and he's grown about an inch since I got him. The Derasa Clam was purchased at Elegant Reef. Louis has some very good deals on clams and a nice selection. The thing I like about Elegant Reef is that he prices his clams by species and not by size. His prices are very competetive. I've had great luck with the livestock I've purchased there. I'm using a 6 bulb ATI T5 sunpower light fixture.