[Mr.Lizard]

I read about differing species of clams generally available and there was mention of some being more temperature-adaptable than others....I think it was when I searched the 'net for Manilla clams....Find ones that are widespread climate-wise and you should be OK. I also acclimated mine slowly from the store bag to tank water temp, and as I did so, I poured out the old water (down the drain) to remove material the clams purged during the process....