Whats this little critter running around?

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James1990

Aquarium Advice Newbie
Joined
Mar 27, 2012
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5
Found this little spikey snail looking thing in my 9gal the other day, what is it and is it harmful?
 

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Looks to be a nudibranch. I can't say for sure, but it looks like one that eats zoanthids that I had in my tank.
 
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