If you have a very low nutrient nano reef, which is tough to do in such a small environment, your clam may need supplemental feeding. However, it was recently proven that giant clams do not need to 'eat' phytoplankton if there are enough dissolved nitrates and phosphates present. Because of this, clams make great natural filters, turning undesirable organic waste into pretty clam mantle! Clams evolved to consume phytoplankton because the water surrounding a reef is very nutrient poor, unlike a closed system, so on a reef clams must derive these essential nutrients from phytoplankton in the wild. Supplemental feeding is not always necessary in captivity if there are measurable nitrates and phosphates present.
Clams will require lots of calcium though, 400+ ppm for optimal growth, so frequent water changes will be necessary to maintain water quality and replace calcium. Weekly partial changes of at least 30% are ideal. I do not recommend anything be dosed into a nano aquarium, water changes are all you'll need.
Clams are fascinating animals that make excellent additions to reef aquariums. The key to success is selecting a healthy specimen, proper acclimation, and patience!
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