<a href=showthread.php?s=&postid=9892538#post9892538 target=_blank>Originally posted</a> by smithcreek
I don't know if you'd call it "research" or more just the experience of the clam experts, but most agree that feeding is not necessary, even for small clams. I guess "research" shows that clams can make enough energy just using photosythesis, and experience has shown they don't need to be fed. Even with the old guidlines of feeding small clams yours would be way past the cutoff.
If you do want to feed, the best is phytoplankton like Phyto-Feast or DT's Phyto. I feed my whole tank phyto once or twice a week, so the clams are getting some anyway. If you are interested in learning a lot about clams get James Fatheree's Book "Giant Clams in the Sea and in the Aqaurium." A pretty quick read, great pics, and answers just about any clam question you can imagine.
How is the clam looking today?