Sort of....it almost swims like daphnea, zipping about a little bit, but not indefinately. It seems happy to perch on glass or down in the substrate at the base of my plants.
Ive never heard of microscopic green diving beetles though have you?
Ive caught nearly 10 of them so far and theres plenty more.
As the tank is still cycling im not too bothered. Maybe ill tie some string to one of the naiads I caught and let it go hunting.
It made short work of the 10 I added to its jar earlier....