Ok so I went to the lfs to get new fiddlers for my newly re-designed crab tank, and they didn't have fiddlers..instead they had vampire crabs. OMG huge deal..never have cool stuff like that here!! I'm used to be paying 2.99 for fiddlers and these suckers were 10.99 but I just had to have them (purple is my favorite color) so I got 3. I must keep these expensive little buggers alive. They are floating right now. I'm reading they are a "true freshwater crab"..I'm very skeptical. Yet worried because there is marine salt in this tank. What's the deal with these lil' guys, anyone know??