Should I Be Worried About This Sponge?

[CathyandWilly]

[size="3"]We have this yellow sponge growing on our live rock. I dont' know whether this is a good thing or a bad thing. Can someone please let me know.

 

[Miss Wiggle]

everyone's got yellow sponge!

it's just a basic invertebrate type thing, neither a good or bad thing particularly i don't think. it won't hurt anyone but it won't do much good either.