HCA: Hermit Crab Association

I'm paranoid and want to check before getting this for the crabs: http://www.amazon.com/dp/B0015BYKL8/ref ... JFFYZ1ARDH Ingredients are: "Calcium (from Fossilized Coral Calcium), Fossilized Coral Calcium, Other Ingredients: None." I just want to double check!

Also, I have a jasmine plant and saw on the safe foods list that the flowers are okay. How about the leaves and rest of the plant?

The calcium supplement should be fine. I'm not sure about the rest of the jasmine plant.

Edit: the plant is listed as nontoxic to other pets on ASPCA's page. It also seems to be listed on some reptile sites as safe for use in their enclosure. Not a definite answer but it's something.