[Wazawai]

At first glance I thought these were standard detritus worms, but after a closer look they don't look (to me) like what I usually see as far as detritus worms go. The leg/barb like things are throwing me off. They are also mostly on the glass and not in the substrate.

These are in future shrimp tanks that I'm cycling. Various things came in on plants; pond snails, scuds, worms and probably more if I spent more time looking. Only really concerned about something being harmful to neocaridina.

Thoughts?

 

[duanes]

Since there are over 4,000 species of Turbellarians, and many have cilia its hard to ID.
Some are parasitic on crustaceans, many are not (simply living on detritus).
Lab 5: Flatworm and Smaller Lophotrochozoans - Zoo-labUW-La Crossehttps://www.uwlax.edu › biology › lab-5--flatworm-a...

 

[Moss Halo]

I'd dose a round of PraziPro and see what happens. They could be parasites of some kind.

 

[somewhatshocked]

I don't think this is what they are but they remind me of Horsehair Worms. Kinda.

 

[Wazawai]

I've been doing a bit of searching and think I've identified them as Oligochaete worms. Many types of them, but found this website with a few pictures, one of which looks like what I've got (even though mine are much longer than 4mm), Oligochaete Chaetochaster diastrophus.

Aquarium Micro Gallery: Oligochaete worms

aquariummicrogallery.blogspot.com

Been keeping both freshwater and saltwater aquariums on and off for over 20 year, still amazes me when I come across something I've never seen before.