I was just vacuuming the tank and changing water and noticed little white worms swimming.
I have never seen them in the tank before (tank was established in mid Jan), but got some neocaridinia about 6 weeks ago with a guppy grass plant and that might have introduced them. They are about 1 cm long, hair thin white worms, swim in a whip motion. They look like a piece of plant root, but are clearly swimming. I do not see any now that the water is changed and everything has settled back down.
Based on Googling, I think they are detritus worms, but wanted to check. Do any parasitic worms fit that description? Trying to figure out if I need to treat the fish. Obviously need to step up tank hygiene.
Tank is a 15 gal
fluval flex. Only has 2 fancy guppies and 1 endler, some neocardinia, and a couple of nerite snails, so pretty sure it's not overcrowded. Has a number of plants.