ID please???

[saltbubbles]

<span style="font-family: Arial Black;"><span style="color: navy;">What are these? What is their purpose in my tank? Good? Bad? </span></span>
<span style="font-family: Arial Black;"><span style="color: navy;">They look like some sort of tunnels attached to the rock. </span></span>
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[ripped tide]

Looks like a type of encrusting snail. When you feed, do they send off streams of white mucus?

 

[lilrobb]

Vermetid snails, indifferent.
Google the pros and cons...

 

[saltbubbles]

Thanks guys!