At the old house, I used to buy clams from Superstore, acclimatize them in my cooler water (68-70F) 20g, then transfer them into my 100g fowlr. I had them live in the fowlr for as long as 6+ months. And the great thing was that if they died or the fish got too hungry, the clams became a food source for the hungry fish. Clams are used to entice finicky fish to eat, so there's almost no chance that if it is on the surface or half buried in the substrate that it would die & rot before the fish find & eat it. At least that was my experience, but I had a shallow substrate bed.
The important thing was to acclimatize them in the cooler water (but warmer than in nature) first for a few weeks. (2-4)
Anthony
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