What is this??

[LeoE]

Can someone please tell me what this is??

 

[Jon Fishman]

Vermited snail tube maybe. A pest

 

[LeoE]

Vermited snail tube maybe. A pest

Is it harmfull or what does it do

 

[Jon Fishman]

Is it harmfull or what does it do

Multiply, Will grow on coral bases...... Some fish will eat the snails that come out of them. Basically I don’t find them overly invasive, so they don’t really bother me. You can try and crush it with needle-nose pliers and see if they are gone for good, and if not, they will just show up occasionally