White fuzz on live rock ?

[cfryers]

All, I am new to the reef hobby. I started my reef tank about 4 months ago, and have been adding small coral frags. One of the pieces of live rock I picked up seems to have developed some sort of fungal growth. I have been trying to determine what this is, with no luck. I have attached an image with the area in question highlighted in red. Any comments on this would be appreciated

 

[cfryers]

Fuzz pic

Fuzz pic

Attached the file this time, last one was too big.

 

[preef]

Looks like they are sponges. Usually a good thing.

 

[cec09]

I believe those are sponges.

 

[aleonn]

Sponges are good, but keep them away from air and microbubbles, which can become trapped in their tissue, release toxins, and result in death.

 

[DLANDINO]

sponges or tunicates good for you! Keep up the good work!

 

[cfryers]

Great, so these are good, and not something that is going to kill everything in my tank. Thanks for the quick responses.

 

[d3rryc]

I've got all kinds that have popped up in my tank - purple, pink, blue, green, white, even almost black. They add nice splashes of color and are usually an indication of good water quality.