Hi All, after a break of 4 years, I have started up a marine tank again. I am currently sitting and watching rocks as I wait out my cycle. As all of you know in the beginning, we can spend hours just staring at the rocks, which in my case, resulted in me noticing a critter which I haven't seen before. Obviously, I would like to ID it before getting anything else which it could harm. The attached photos aren't great so I apologise (cell-phone pic). Basically, it looks like a cross between an ant & spider, its black with orange dots on its abdomen. Is it safe/not. Thx in advance.