Sponge is killing my zoo's

I have a pink sponge that has taken over a rock that my zoo's live on. Does anyone know of a good way to kill the sponge with out killing the zoo's?
 
I have done this in the past...

Take the rock out of your tank and expose the sponge to air. Then use a toothbrush and gently brush off the sponge. :D
 
Sounds like a plan, I've got some green sponge that looks really cool, but it has wiped out 2 zoa colonies. I'll give the air and toothbrush routine a try.
 
Bada bing bada bang no more sponge!!

Thanks Blide nice tip worked great used the wifes tooth brush :lol:

Just kidding have a great one!
 
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