Posted by Helge on October 03, 2005 at 11:40:17:
In Reply to: tiny black worm type insect on waterfall posted bykathleen cotrell on October 03, 2005 at 08:26:16:
They could be a form of bloodworm. They cause no significant issues in the pond. Actually, they assist in removing nutrients from the pond and some fish and birds will actually feed on them.