Sand dollars are found by the thousands on beaches near where I live - but water temp is 40 deg F - I saw Bob Fenner once say it is possible to keep them sometimes, but another post on WetWebMedia disagreed - see below
Sand Dollars (3/28/04)
Hi,
I live in Jacksonville, Fl. and picked up (2) live sand dollars at the ocean. I was wondering if these would be okay in a 55 gal. aquarium. Thanks, Dwight