What eats sponges?

Sherita

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Ok, I have this yellow sponge that is overtaking one of my rocks. It's to the point that I can't put anything on the rock, because the sponge just smothers it. Taking the rock out is not an option, since it is on the bottom of my tank and I would utterly destroy several corals to get to it. So, what eats sponge? I have got to take some kind of action before this blob takes over the right side of my tank completely. Anything out there that would be reef safe but still eat sponges? BTW, I have no "display" sponges, so said critter could eat to its' hearts content.
 
Angelfish eat sponge, but it's not a significant portion of their diet. Which means growth would probably be faster than what one would eat. I'm not aware of any obligate sponge feeders either.
 
Flame angels have taken care of all my sponges with the exception of the harder yellow sponges that I actually had to buy. They do seem to eat all the hitchiker sponges, he has tried to eat the yellow (ball I believe) sponge but I think it is a little to dense to eat. A toothbrush would remove it temporarily but probably not for long.
 
Isn't a Moorish idol said to eat sponges?

I have some yellow that's covering a rock and all if the bone structure of my trumpet corals
 
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