Please help me identify some random things that showed up in my tank *56k warning*

[edrock200]

Hello all,

I have a fairly new Reef Tank..it's been setup for about 4 months. A few items have appeared which I did not introduce into the tank and I was wondering your you all could help me identify these items and tell me whether or not they are bad for the tank. Thanks in advance for any help.

Item 1: This pink coral looking item that started growing in between my yellow corals:

Item 2: This pile of black stuff thats on the underside of my liverock:

Item 3: This zebra striped item thats sitting on my life rock in between some coral:


Thanks again,
-Ed