As a baby or juvenille, clams can be housed under vho or pc lighting, up until they reach around 4" or so as they require phytoplankton for food. It isn't til they get bigger and older that they need intense light for food. But in all fairness, if you don't have metal halides, I wouldn't chance it. But if you do, go with either Squamosa or Durasa(Tridacna's).
Let us know what you decided to do? _________ 125gal.w/Mag9.5 return(dual megaflow)>Mag7 pump Aqua Cev180skimmer.Wave2k Hamilton Reefstar(2)250watthqi(mh)pend.a Yellow, Naso Tang Red Lip Blenny Percula Clown Demoiselles Niger Trigger F. Wrasses Ceriantharia Orn.Shrimp and Stars Hermits Queen Conch asst. snails> Stars Zoos shrooms Montipora Brains Gorgonians Favia Turbinaria(large+small polyp) Acropora Xenia Tridacna (CroceaMaximaSquamosa) Leathers <35+75gal.reef tank as well> 
"IF THE PHONE DOESN'T RING...IT'S ME"  jb  |