Sponges on rock

[bob`_your_dog]

Okay i must appologise for all me recent questions but hey. I just bought 4kgs more of live rock, most of which is old coral skeltons (i'm not sure if thats good or bad, but it looks really cool - especially since i cant afford any live corals) anyway, the one piece is allmost completely covered in some sorta sponge, it's kinda orange and fluffy i dont know how else to describe it.

Well my stupid question of the week is, does anyone know whats it's really called or have any info on it, cause a little is cool, but i dont want my whole collection of rock covered in sponges.

 

[Opcn]

If sponges get air in them death follows shortlyso be forewarned

 

[Navarre]

It depends whether its a light loving sponge or not. If it doesnt like the light and you hace the sponge face up then it will die of slowly. And of course the fish may well find it a true delicacy. I would not be overly worried as these things rarely take over tanks and are easily controlled.