Worms in my shrimp tank

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I have a 20-gallon shrimp tank that's only around 3 months old with less than 15 shrimp in it. At night when I went to turn off the lights, I saw these worms that were on the gravel and and rocks. My first thought was detritus worms since I did have those in the past but these worms were brown/red and longer than the detritus worms I had in my tank before. It also could be the fact that I used seachem fluorite red with no cap that caused the worms to be brown/red but I'm not sure. Any ideas?

 

[Colin_T]

Pictures and or video of the worms?

 

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Pictures and or video of the worms?

Pictures and or video of the worms?

 

[Colin_T]

tubifex or black worms, nothing to worry about. The fact they are growing in the substrate just means the conditions are good.

 

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I forgot to mention that the lava rock I

tubifex or black worms, nothing to worry about. The fact they are growing in the substrate just means the conditions are good.

so not parasitic?

 

[itiwhetu]

No, these guys are fine.