I hate to say it because they are gorgeous, but the halloween/electric orange hermits that are sold out of hawaii - not reef safe... well.. to an extent. I Have tried 4 and everyone of them is absolutely in love w/ every other crabs shell, regardless of size... they (all at different times in different tanks) executed every single crab and snail i had. maybe others have good experiences w/ them, but i will only put them in a species only tank if i ever did a nano i might use one... doubt it though...

electric blues seem far more passive.