[silver616]

I use the Repti-sand...I've tried the calci-sand, but I don't like it b/c it seems to clump when wet and they didn't seem to like to dig in it as much as the regular sand. I know some people use just regular play sand b/c it's cheaper.

As far as looking for a healthy crab, you'd want to look for one with good, bright coloring and all it's limbs and pincers. Sometimes it's hard to tell if they're active in the store environment, but active ones are sometimes considered to be healthier. Also, if the store tank is in the right range for temp and humidity, the crabs will be healthier.

I use the Oceanic natural sea salt and mix it with spring water.

My crabs really like hard-boiled egg yolks, grapes, cornmeal mixed with honey, all natural peanut butter mixed with ground flax seed, Top Fin Large Medley (no harmful preservatives), any of the Hikari Bio-Pure freeze dried foods, coconut, blueberries, spirulina powder, organic baby foods (esp sweet potatoes and peas), broccoli, and on and on...my little guys aren't picky!!