growth on live rock? ? help

[lov4boxers]

We have a one stalk with 6 heads of candy cane trumpet corals. Do u think it is the candy cane trumpet? This came up about 2 weeks ago and it's growing really fast! Looks like the tentacles are a translucent color and the tips are a white/neon green? ? Can anyone tell me what this might be and if it's a good or bad thing in my tank.

 

[BillNye]

I'm interested in your first picture. I have found a few of these on my rock as well...

 

[pyithar]

first and last pics look like white ball corallimorphs to me. not sure about the second pic though.

 

[duckmeat]

Google ball anemone. Pretty sure thats pic 1 and 3
funny i just found one in my tank last night. Thats y i recognize it