What is this fish parasite??

Tonight while feeding some baby angelfish my wife noticed something in their
tank. There was a very hard to see "thing" in with the fish. The thing was
much smaller than a human hair and was .25" in length. It had a bump at one
end that I would presume is its head. It was white all over.

After finding this in our baby tank, we looked at our 75 G. adult tank.
Amazingly, we spotted one of them near the top of the tank. It was the same
as the other, but was .5" long.

The fish stayed away from this and did not try and eat it. (They get live
baby brine shrimp regularly and are used to live foods.)

What is this thing likely to be? Is it a concern? How do we get rid of
these? I'd assume they're more that we're not seeing.

Tony