Mussel Growing on SPS Frag

Is it still looking healthy or is it starting to recede or bleach?
I dont really see it doing much harm. But ya never know!
 
Not saying that it can't happen. But I don't see a mussel growing on SPS.Are you sure it's not some type of snail.
 
I had a chalice with some sort of clam growing in it a few years ago. It didn't turn out so well for the clam when the chalice started growing. Still they seemed to have spread as I found tons of them when I had to rip my tank apart to move a while back. Anyway if the coral looks fine I wouldn't worry about it.
 
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