What's this?

[kgstei]

I had to rescue my Lubbock's wrasse from the Overflow today. I found this on the pipe when I pulled it out. It's attached, a hard shell, what is it?

 

[MofoCorals]

vermetid snails - superglue the tip of the funnel it creates

 

[kgstei]

vermetid snails - superglue the tip of the funnel it creates

Thank you. I see an untimely demise in its future.

 

[FishieBusiness]

+1 on the vermetid snail