These two in my tank are several inches in length and live in the live rock, not the sand. I was never concerned about it before, b/c everything I had read said they were harmless. Now after reading what was written on the other thread, I should get them outta there.
I should have been tipped off when I saw one eating through a blue ridge coral and the other trying to catch a snail.
Live and learn. :doh:
Anyways, I still need a trap!