free swimming wiggly white thread worm, about 3/4 of an inch long... food or threat???

[Magnum Man]

was looking in my cherry shrimp tank, looking for some tiger limia's, but they must not have lived through the heater off period... literally 100's of cherry shrimp, in a 10 gallon, I don't typically add much food, could have been a detritus worm, or??? looked like pictures I've seen of vinegar eels...but I only saw one, I tried to take a picture, but too small, worry it could have been a parasite i. one of the limia, that didn't make it...

any other thoughts???

couldn't zoom this picture enough, to make it out...

 

[GaryE]

It sounds like harmless detritus worms. Some fish will eat them. They grow to visible sizes with overfeeding. Now, why do I see them occasionally? Almost every older established tank has its moments.