White worms, parasites or harmless?

[Sturgeon]

In my ARTC's tank, I notice there are small white worms that swim around. They are between 1/8" and a quarter inch. The ARTC still eats well, I fed it a small piece of raw hamburg tonight. I've tried clearing up these parasites before, but Parasite clear tank buddies dont seem to help. When i put a few feeder goldfish in, they eat the worms. water changes seem to reduce the numbers too, but not entirely. Should i be treating these? or should I jus feed less and change the water more often?
Thanks in advance to anybody who has input or advice.

 

[Modest_Man]

Normal. They usually signify that your water quality is not up to par. Clean the gravel well when doing some water changes, they'll dissapear with proper upkeep.

 

[guppy]

Are they round or flat? Flat worms that mainly stick to the glass are usually planeria, round free swimming ones are usually microworms, greatfood for small fish. The source for those is usually your filter pads where they feed on bacteria.