Quote:
Originally Posted by swill
...and now I am loosing the other clam 
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thats about right , its common for one clam to die then another die as well, the issue your new clam had has been passed to your other clam , could be a pathogen of sorts we dont know but its pretty common, sorry to say it but all your clams are probably toast except the most hardy.
have you ruled out predators like pyramid snails?
where did you get all your clams , how long have you had them,what do you use for source water and what type of clam are they........your answers are prob in one of these four questions unless your tank was inadequate for them to begin with.
this is the reason you dont see clam dominated tanks very often , in fact you never see them , a nice as they are you would think lots of people would do a clam only tank , realistically though they tend to die in numbers and for odd reasons of which prob has nothing to do with us or has everything to do with us.