I found mine in a heavily vegetated backwater of a river over a sand/muck bottom. I used a finer than normal dip net and dug it into the thickest vegetation I could find. I then hand sorted through the vegetation, keeping an eye out for the little buggers. Sometimes they are flopping around a bit making them easy to spot, most of the time though they don't move much making them tough to spot with as small as they are.
