He didn't say he bought any fish, just coral and a featherduster.

Not related.

I should have walked away when I noticed the sick fish but I haven't noticed anyone with feather dusters in while.

From what I read there called a Dino simply from the whip like tail they use to propel themselves

Correct :)

From the short time that the fish looks sick, to being dead, And the looks of the body's after, I'm pretty sure it's marine velvet. At this point there's nothing I can do now but wait until the parasite starves itself out. I just hope that everyone else who reads this is more cautious than I was when they purchase their next tank inhabitant.

So I'm confused lol can or can they not cause MV? I've read they could or at least carry it in the goo that sits on the sand, but have also read its bologna lol. :S

I'm assuming that the water that was inside the worms tube had enough parasite to start multiplying and cause the outbreak

There's lots of different dinos. 1700 alive marine species

http://en.m.wikipedia.org/wiki/Dinoflagellate

Ahh I get it now. Lol. Thanks Nick