HCA: Hermit Crab Association

Since you've come to the emergency forum, we know you want a fast answer to your question. In order for us to figure out the problem as quickly as possible, we ask that you answer the following questions as best you can. Some of them may seem odd, but they're all designed to give us the information...

Hello, everyone! I have a question.... can I offer dried seaweed (the kind sold in pet stores for certain fish), to my hermies? I have recently adopted 6 smallish PP Crabs and want to offer them a variety of goodies.
I change and add stuff to their tank every so often, to keep intrest up!
Thanks!