This is my experience with these critters.
None has ever bothered a "coral" in my tank.
20-55 gallon package;
20 Scarlet Reef Hermits - reef safe, no problems whatsover
20 Blueleg Hermits - reef safe, but may attack a dieing snail for it's shell, or just flat out attack a snail.
I've seen the Bluelegs fight with each other and scarlets.
20 Turbo Snails - totally reef safe
1 Sally Lightfoot Crab - some have reported problems - some have not - considered reef safe by many. Mine ate coralline algae like it was going out of style - back to LFS.
2 Brittle Stars - reef safe to best of my knowledge - I like these guys.
1 Coral Banded Shrimp - again some report fighting among other shrimp, and they are built for making trouble - 1 in tank only unless you get a mated pair.
3 Emerald Crab - reef safe IMO - never had a problem with these guys either.
If you are concerned about any critters in a package - I'd consider the U-Build It - and just get what you want.
Later