http://www.longshorthair.com/hair-algae-freshwater/

Worms in my tank?
I have a 20 gallon tank of freshwater with 7 tiger barbs, 1 Albino Algae eater. I try to do water changes regularly, and not long ago. Tonight, I threw a flotation plant counterfeiting of my fish are protected by a deposit of light, and when I did, I noticed some little things squirming in the water – For small small small. I do not know wtf they are? I had my tank for over 3 years and have never seen these things before. I am very concerned because now I realize a ton, would give an image, but are so small that I do not pick up my camera. It's almost like dog hair – that's what I thought it was before – but then I saw that many of them moved. Any idea what they are and how the hell do I get rid of them? Are they harmful?
She had my tank a while ago, and my betta does not eat. I asked and they said they are not harmful, but I am a worry wart that I suck my gravel vacuum. They are gone now. I think they have something to do with the waste until the gravel and everything.
otocinclus species