sean mckinney wrote:
Leeches are almost inevitable in a planted pond, however those in my
ponds do not appear to be the blood sucking types, I believe that means
they eat detritus.

I think the non-blood sucking types mainly eat living things, i.e. they
are predators. No time to look for a proper reference link, I'll
apologise in advance in case the following insults your intelligence

http://www.biokids.umich.edu/critter...Hirudinea.html

I've seen leeches swimming in the river Soar, against the current.
Quite good swimmers.