Help!! Sponge issues!

I had something like this on a zoa frag once. I used peroxide dip and 3 dips later all gone. I also used a soft tooth brush and tweezers to pull off the big clumps. Not so sure you can/should proxy LPS though...

 

I had a yellow spong on the branches that turned out to be irritating the frogspawn. +1 on the dip.

 

That stuff can be pretty nasty.

I do know that most sponge cannot take air exposure. I would wrap the heads in brown paper towels, wet and let it sit out for 10 in or so. Repeat as needed.

 

Scrape it off then dip, I had the same deal.

 

I have the same sponge on my frogspawn branches however it is not nearly as bad as yours

 

Have you tried scrubbing with a tooth brush.