Thanks Scott, this seems like a very cool site. I am new to saltwater tanks and this has been a good place to search for help. Thanks guys!

I bought some new live rock for my newly established 29 Gal tank and noticed a few things I can't identify. I think the 2nd may be some form of sponge, but not sure. It almost looks like a transparent spiderweb the way it intertwines. The first I have no idea. It is blackish-greyish and is kind of r...