what kind of clams????? the only clams u can keep under pls are derasas, squamosas, hippopus, and gigas whch are all hard to come by and ur tank MUST be shallow..... provided u can give them the proper environment like high cal/kh ang little salinity and ph swings.... little clams need feeding tooo
and a puffer is nt reef and invert(including clams!!!!) safe
suggest u remove ur puffer unless u wan to give it an expensive snack