i believe she answwers your question, they do eat crabs and shrimp, they will eat anythign they can fit into their mouths, shrimp, crabs(yes hermits too) and smaller fish,
her answer was good and the fact that she used the same reference you did, shows that you apparently had the answer before asking the question, anyhow, no they will not be ok together for long(maybe for a bit) but i woudl not bank on any long term compatibility of the fish AND inverts you have with him
now SORRY, i really don't want to tell you this, but not only that, but if you are not already over stocked, he would definitely put you there, easily
HTH and good luck