Hair/spider web like stuff coming from "stems" on

[SCFatz]

One of my live rocks has short lttle brown stems on it.On occasion they "shoot out" a thin string out into the tank.One end stays attached and the other just floats around.The longest i have seen is about a foot long,more often then not they are just a few inches.

Also,most of the time they are no strings at all...I'm not sure at all why the come out nor have I been able to corralate the sightings with any thing I do with the tank like feeding,cleaning ect.

According to the wife the retract back to the stem,but I have not seen that happen yet.

Each stem has only one "string" and each string is about the diamater of spider web material.

Any ideas as to what it is?

 

[Fluff]

Sounds like you have some Vermetid gastropods. They are snails that build calcareous tubes and send out mucus coated "stings" to collect detrius. They are harmless.

 

[SCFatz]

Cool...thank you very much.