Lines in the sand?

[sansouci01]

Always something new to look at when you have a salt water tank. Just started to notice these strange lines on my sand bed. Are these new critters in my tank? I haven't seen anything moving on the sand bed. Just strange lines. Hopefully nothing bad...

 

[Mr tap water]

hi there ,
they look like spaghetti worms to me.

 

[sansouci01]

Thanks...Just one more creature living in this tiny ecosystem.