The other day, I was cleaning the sponge filter for my
barrel pond, and I found a small number of tiny creatures
on it. They're about 1/8th of an inch long, translulcent
and kind of shaped a little like shrimp. They have a
number of tiny legs like an insect or crustacean.

Anybody know what these are? Fish and plants all seem
healthy. Any cause for concern?

-malcolm