What could this be under my sand?

Holy handgrenade

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I assume it is a worm but could it be harmful? Didnt find the worm or critter that made these but did find this tube that seems to be made of a mucus or something that holds the sand together to create this tube. Nothing seems to be out of place or eaten but was curious and wanted to check

20220226_172700.jpg 20220226_172656.jpg
 
I have something very similar. Shortly after feeding a long single filament will emerge and flow around with the current. Then it will retract until next feeding. Totally harmless in my tank. (Only my opinion)
 
I assume it is a worm but could it be harmful? Didnt find the worm or critter that made these but did find this tube that seems to be made of a mucus or something that holds the sand together to create this tube. Nothing seems to be out of place or eaten but was curious and wanted to check

20220226_172700.jpg 20220226_172656.jpg
Can be a tubeworm, vermetid or spinoid. As long as you have the tube in your hand, a good opportunity to discard. You can place it in a cup of tank water but you dont want the above listed in your tank and multiply
 
I have something very similar. Shortly after feeding a long single filament will emerge and flow around with the current. Then it will retract until next feeding. Totally harmless in my tank. (Only my opinion)
These are spionid worms or spaghetti worms.
(People often misuse the term to describe hair worms, but spaghetti worms build tubes out of sand and have a feeding tentacles that extend from their head. Hair worms have lots of tentacles all along their body and don't create a tube.)
 
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"The name "spaghetti worm" predates the reef aquarium hobby by several decades... In all cases, prior to recent usage in the reef hobby, this term refers to the worms in the family Terebellidae. The terebellids live in tubes in sediments, rocks, or debris, and do not normally leave the tubes."

"Recently, in the reef aquarium hobby another type of worm has been being called a "spaghetti" worm. These are "hair worms" in the family Cirratulidae. Cirratulids have a much more uniform body than do the terebellids. Each segment looks much like the next, and while a head is present, the remainder of the worm's body is not divided into sections. There is neither a thorax nor an abdomen. Additionally, the cirratulids found in aquaria do not live in tubes but are found living free in the sediments below the surface."

From http://reefkeeping.com/issues/2002-06/rs/index.php
 
These are spaghetti worms.
(People often misuse the term to describe hair worms, but spaghetti worms build tubes out of sand and have a couple white feeding tentacles. Hair worms have lots of tentacles and don't create a tube.)
My spaghetti worms are red…. Bristle Fan Worms make tubes. Medusa worms make tubes. It could be a lot of things
 
My reply was to chandavi's post.
I know, I replied to your reply. I think spaghetti worm is a generic term used for the look of possibly lots of different species of worms. No scientific facts behind that statement but just my opinion.
 
I know, I replied to your reply. I think spaghetti worm is a generic term used for the look of possibly lots of different species of worms. No scientific facts behind that statement but just my opinion.
No, there IS science behind my claim. I posted parts of an article, and the link, to explain it.
 

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