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This black thing is huge. It is about 5" long. Is it harmful and if it isn't, do people usually keep these in their tanks or get rid of them?

Can anyone tell me what kind this is? I got it free in a package deal and want to make sure I care for it properly. Thanks.

I bought a large live rock and put it in my QT tank. A little while later, my son who had been hunting brittle stars tells me there is a strange fish in the tank. It had been inside the rock and was now swimming around. Anyone know what kind of fish it is and if it is reef safe? It also...

Black mold -- Something seems to be happening to my polyps. The rock used to have a lot more of them on there and they're slowing disappearing. Some of them look like they're half eaten (A in first photo). Also, there is some kind of black mold around and on some polyps (B in first photo)...

I have noticed two of these guys on two separate rocks. They are translucent white and phallic looking. They send out long, hairlike strands that I think they use to feed, but if they have stinging capabilities, it worries me. Anyone know what they are and if I can remove them manually without...

Like others have mentioned lately, I have started to get a reddish brown accumulation on my sand in a few spots that matches that on the glass when my turbo misses areas. It only shows up in spots though, mostly near the front of my aquarium. Strangely enough, it has also deposited reddish brown...