A friend of mine told me that you can put little neck clams from the seafood market in a SW aquarium. Is that true? I told him I paid 4.99 for one clam and he said that he got a dozen for 20cents each. If that's true I feel a little ripped off from saltwaterfish.com ... How many clams should a tank have per gallon? 12 sounds like alot. If this was true I was gonna get a half dozen for my tank. Let me know, thanks.