Liverock ID

[adinap]

I need help identifying these 3 items that are growing on my live rock that I have had since March. They just started growing last week, and I'm not sure if they are good or bad! Thanks!

http://pierceimages.com/shutterbugs/liverock.jpg

Adina

[rshimek]

Hi Adina,

They look like Padina, a brown calcareous alga.

This species can become a pest in some tanks. Not many herbivores will/can eat it.