Need help - Philippines Crustaceans and inverts

Here's my second post of crustaceans and inverts I could not identify from a trip to Anilao.

A hermit crab seen on a night dive. Eye stalks don't seem to match anything I've got in a book.

A few I couldn't get into the first post.

These were a bunch of little crabs scurrying between one crinoid and another on a coral

This guy was super-tiny. The body is maybe 5mm across

Sea cucumber I didn't find