Can't answer the flow Q.
We have a porcupine and a dogface. We have them on a frozen varied diet which includes:
White shrimp (chopped up, w/shell)
Squid
Krill
Brine
Bloodworms
Silversides
Our dogface was raised on food pellets, so we give him a Wafer every other day to file his teeth down with. He won't touch live shelled creatures!