Looks like a bristleworm to me. Redish in color maybe? Most likely a hitchhiker on some rocks you purchased.
I suck up a couple little ones in my tank every PWC
. I've a shell based substrate they just love to hide in. Recently I found one running around the LR
as well in daylight (Not common).
NOTE: Be very carefull handling. Kinda like touching fiber glass. Use tongs or a net. Tongs usually cut it in half though. I've better luck just sucking them up during a PWC
75gal Salt, 18gal Sump, Skimmer, 60lb Live Rock, 90lb Live Sand, 3 Pwrhd, 2x55w Actinic, 2x55w 10k. Guest list: Goby Green Clown, Percula Clown and entire clean up crew.