Worms, flukes or leeches ???
Hello - new here. I have a 5 year old 46 gallon tank with one tetra (pristella). Yesterday I noticed small worms on the bottom of the tank. Most couldn't be seen without a magnifying glass, but one was large enough to see, and it's tail (?) was stuck to the bottom glass (I don't have gravel) so I could see it fairly well. It was white and less than 1/8 inch long, and was struggling to free itself from the glass. At first I thought it was a baby tetra, but it definitely isn't. The others are so small you can barely seem them and only with a magnifying glass. They are slithering across the bottom. Do planaria typically crawl like that, or could this be flukes or leeches? I do a 20% water change every 2 weeks. Not often enough maybe??? At 5 years old, my fish doesn't have have much time left, but I certainly don't want it go out that way! I've attached a short video which isn't great, but the best I could do. I would appreciate any expert input on what this could be, and what I should (or should not) do. The small ones will soon grow!!! Thanks, cMc