dunkan

So I have a 20 gal aquarium that has been running for almost a year, and since July Dino’s have appeared, first i thought it was cyano but now with some tests I know it’s Dino’s, I have been running a UV light. I first try to remove it from the normal ways, increase nitrates, blackouts etc...

And what are those yellow lines or fibers inside (maybe outside) of the body are? Isn't it disease?