I just noticed something new in my tank, I is in a hole in one of my live rocks next to my Watchman Gobie. I don’t know if it is dangerous or not. It is about the size of a matchstick, it is tan to light brown, it has spike like things along the back and looks to have claws or some kind of pinching things (looks like the head of a slug). I added live rock on the 17th of August and I have not heard any ticking during the night but then again I have had my AC on.