Jose posted a short video of the hatch. If you EVER get a chance to be here, it is spectacular.
http://www.youtube.com/watch?v=Qw_gioBsWiU
The worm is about an inch long and 3/16 in dia, it uses a jet thrust out his a$$ for motion. You can see them in some of the surface shots, but the underwater shots are better. Look for a small light colored dart moving moderately fast..
As far as the fishing,, it is mentally, the worst fishing in the world. There you sit watching thousands of Tarpon and other fish and none will bite your Weiner...
I have tried to get the Tarpon to bite during a hatch. It is almost impossible as they not only are stuffed with worms,, but it has a drug effect on the fish.
They will actually run into your skiff like drunken sailors..
The wispy white and white & pink are a couple of my attempts to entice them,, best so far is a 12/0 3 oz gang hook of 1/4 inch nylon deck rope..
PS: You can call them Palolo or Palola, either is correct..