Today I noticed some white worms in my planted tank. They're incredibly thin and small and they wiggling around when in the open water. They're roundish, so they're roundworms and are segmented from what I could see.
Are they harmful to bettas? The tank is currently empty of fish and I've been changing the water a whole lot this past week. I'm also going to be gone for a week on vacation and are they going to overrun the tank while I'm away?
I have a 10 gal tank, sand bottom, 2 anubis, 1 java fern, and some duckweed.