What are these worms and are they harmless?

[kandymann]

Hey guys
I was examining the glass on my 30 gallon FOWLR (dwarf angel tank) and found three different worms on the glass. I placed them under a microscope and would like for someone to identify them. I hope they are harmless to fish.

Thank you!

 

[Marty.h]

2nd one down resembles a bristle worm the other 2 I don't know.

 

[Humblefish]

2nd one down resembles a bristle worm

I agree. The other two resemble roundworms (i.e. nematodes) - I can't identify the exact kind. However, I will consult with a colleague of mine and get back with you on this.

 

[kandymann]

Thank you for looking into this for me. My fish shows no signs of irritation and is very healthy. I have never noticed these worms in my aquarium before and just want to be sure they are not parasitic to my fish or myself.

 

[Humblefish]

So my associate has confirmed #1 & #3 are nematodes. She cannot confirm the exact species, but feels confident they are free-living and NOT parasitic.

 

[kandymann]

Thank you very much for your willingness to help me identify these worms. I think they are probably fine too.