You would be limited to Squamosa or Derasa clams (sorry, but maximas and croceas would be a HUGE gamble). Even then, those two will survive, but likely not thrive....they STRONGLY prefer metal halide. They will also outgrow your tank.,
If you're serious about a clam, I strongly suggest you read "Giant Clams" by Daniel Knop and learn about their specific care requirements and upgrade your lighting. Best of luck!