What might this be ?

[tribal]

My tank is in its 3wk of cycling. Today we noticed that on a piece of live rock. There is a (seems to be plant life} orange creature the size of a matchead in a very tiny hole in the rock. when you get close it zips back in the hole. And then when all is clear comes right back out. Any idea what this could be ? Sorry dont have any photos. thanks for your time.

 

[zoocraze]

This is probably a feather duster. Filter feeder. Will not harm anything in your tank. A pic would help if you need more info.