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Ok what eats clams and scallops besides me of course. Found my clam dead 4 days ago and today I found the scallop shell empty. The clam was shrunken down to almost nothing. Nothing else seems to be affected.
A harlequin shrimp only eats the tube feet off of starfish so I don't think that is your culprit. Both clams and scallops are very sensitive to water quality so check your parameters. How old was your tank that you put them in? They usually suggest waiting 6-8 months before putting a clam in a tank.
Scallops are notorius for dying within six months. They are very hard to feed and use up their "storage" before then.
Sorry to know that rich. I am thinking of putting clams in my system as well, but cheaper ones than the one you had. I did read some posts saying whelks( snails of some sort) eat clams and don't bother anything else. You could perhaps research it and find out if you have any.
ive had a problem keeping clams..turns out..my magnesium was low..i got help from a company that specializes i clams..mjm aquaculture..he told me clams need magnesium as well as really good water parameters..check your levels..dose..wait a few weeks/months before going with clams again..