Peter wrote This one is smaller (1 inch) and wrigglier (?) and looks like a
transparent
worm which keeps going into a U shape.

I entered 'transparent leeches' in google and I got back this very interesting
page
http://www.4qd.org/Aqua/Worms.html
(also got all sorts of B movie hits...)
and I like this critter
Oligochaeta
because it mentions transparent versions.
And this page is from the UK.
This here
http://images.google.com/images?q=Ol...hl=en&btnG=Goo
gle+Search
is a link to google images.
(Do *not* view with a wonky stomach!)



kathy :-)
algae primer
http://hometown.aol.com/ka30p/myhomepage/garden.html