What are these?

[StartingATank]

So, first of all, I couldn't get a picture of them because they are so small and the same color as my rock. Secondly, They look like a worm, like an earthworm, that is an eight of an inch long with very small axolotl horns on them, which the whole thing is the color of natural live rock without the purple algae. Third, I introduced new fish 2 days ago and then this appeared, I got a tomini Tang, a blue spotted goby, a sea cucumber, and a couple snails. I accidentally have been feeding too much to my fish, and so there is a big nitrate and phosphate bloom. Nitrates are 24 ppm, and phosphates are .10 ppm. What could this be.

 

[Gumbies R Us]

Worm could be a bristle or bobbit worm. Need to see pictures of everything, if you can get pictures.

 

[BristleWormHater]

There's thousands of species of marine worms, can't ID based of a description with no image. Your nitrate and phosphates are fine, id bring nitrate down to 20 and phosphate is fine .10 is in the ideal range.

 

[StartingATank]

I have tried to get a picture but it doesn't show up in the image

 

[bluemon]

Can you try sucking one up with a turkey baster and putting it in a cup with a white background?