What is this snail/slug thing

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Laurie123

Aquarium Advice Newbie
Joined
Dec 12, 2013
Messages
1
I have a 500 l aquarium with 60 kg of live rock. I have just started and have got a yellow tang,night clownfish and a regal tang. I notices this worm creature I tried to catch but I quickly went away. Then I saw these white slug/snail things on my coral they are white and are about 1 and a half centimetres long. I then caught them.
 
A picture would be a big help. There are good things and bad things that resemble the things you describe.
 
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