Any clams that will work in a cooler water tank?

[pfan151]

I have a seahorse tank set up that runs at 71. Any clams that will work at that temp?

 

[Bongo Shrimp]

Typically Tridnacnids are found in warmer water so I don't think those temps would be optimal. Not to mention that the seahorses would bother the clams a lot by touching them and potentially sitting on their mantles. The clams could then react by closing quickly and they could even catch a seahorse this way which would definitely hurt and possibly kill the seahorse.