help with identifying a recent growth

[les1001]

Hi all,
im new to reef tanks and have managed to navigate my way around several issues, the usual newbie stuff, algae, water balance issues. But i have a piece of live rock with some daisy coral and what i belive to be a pulsing xenia coral. im open to being wrong on that though.
heres my question in the last few days ive noticed a cream/off white growth around the xenia coral. it looks vaguely sponge like and is growing quite rapidly. can anybody please tell me what it is, if it is bad and if it is how to get rid of it.

 

[les1001]

i did post a picture with it but it appears to have gone astray

 

[les1001]

take 2

take 2

hopefully pic attatched

 

[mcgyvr]

Picture is way too small...

 

[oldhead]

Using the zoom to 500% it just looks like a sponge to me.