Are there reef safe and non reef safe hermit?

[FitoPharmer]

IMO, no. I would not consider any larger hermit crab to be reef safe. I only like the teeny tiny hermits.

[Reef_Geek]

I'm not sure about being "reef unsafe" but bigger hermits are annoying. They knock over and dislodge smaller coral pieces... I find corals laying on each other and half dead after stinging each other... big hermits may also hunt smaller hermits. I got a clean up crew as part of a package from a tank shut down deal along with mixed hermits... when I got some new smaller hermits, two older big ones were repeatedly seen holding new hermit shells and trying to pull out their contents. The two big hermits went for a flight out the window and into the woods... haven't been a problem since.

[Northernseacorals]

Totally agree with Reef_Geek,

I've had a varied experience with hermits, sometimes good, sometimes evil little buggers.