Well if it is 5" long then Krj-1168 is right about it being saflely over 2 weeks old. But if you can find out how old it is then thats great too. You should buy a set of aquarium tongs so you can stick feed it and that way you will be sure it gets every piece and the left overs wont turn into nitrates. (but make sure there is something for your hermits to eat). For a diet you should feed lots of different kinds of fresh seafoods like squid, scallops, clams (out of the shell), mussels (out of the shell), Ocean smelt chunks, and outher fresh seafoods you can find at your local grocery stores fresh seafood counter. But stay away from the oily fish like mackrel and things like that since they will foul your water very fast.
Hermit crabs make good cleaners since the sharks can't get them. I have lots of zebra (AKA left handed hermits) in with my bamboos and they all do very well.
Hermit crabs make good cleaners since the sharks can't get them. I have lots of zebra (AKA left handed hermits) in with my bamboos and they all do very well.