01-06-2011, 04:46 PM
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you need to research. You stated clams, most freshwater river "burrowing bivalves" have the Glochidium larvae which does use a fish host. I have no idea what you mean by mollusk since that term covers a almost a whole pyhlum including snails, bivalves, slugs, and squid. The larval stage is not very harmful in the wild, but in a aquarium you are looking at much smaller volume and the larva like to attach to the fishes gills.
Pond soil will contain a massive amount of micro organisms, both good and bad for fish. You can use it, but expect to have critters in your tank that are possible harmful. A number will survive drying out via eggs and such.
Last edited by Mikaila31; 01-06-2011 at 04:50 PM..