I have a pencil and pincushion urchin, neither one of them sting. The tuxedo does not sting. The long spine urcins are venomous. I pick up my pincushion with my bare hands. You really would have to push hard for it to break the skin. I will say, the pencil urchin will move some LR
. Your list of critters look good. I do believe they are reef safe.