Swear i just saw a tiny worm swimming around

[SSnyder]

Thought i just saw a tiny worm like thing swimming in my tank rather fast i scooped it out does anyone know what this may be and is it harmful to my fish?

 

[Lupin]

Pictures?

 

[rob0521]

was it brownish/black in color, about 1/2" inch long? if so I had a few of these in my 10 once... didn't seem to harm the fish i actually saw them eating them.

 

[Red Devil]

some are harmless... theres alot of stuff in the water that we just don't usually see, but of course keep an eye open..it could be our NY water ....

 

[guppy]

Is it rinded like an eartwom? Smooth and round" Flat? There are several possibilities.