Hi Ken,
To give you an idea how specific some of the sand requirements are, the amphipod that I mentioned before requires a grain particle size of 0.113 mm. Not 0.110 mm, not 0.115 mm, but 0.113 mm. Unless a local saltwater store has a dsb with varying sand grain sizes and zero sand sifting creatures, I doubt that they will have some of the animals that I am looking for.
What I am looking for is a source where I can obtain more sand bed animals that would typically not be found on live rock.
Thanks,
Mitch