I have noticed brown spots on my java fern for quite a while. Today I put a leaf under a microscope and discovered they were eggs. Very tiny yellow globules encircled by a segmented brownish red worm. When I put it under the microscope light the worms flexed and released like a spring, spraying the yellow globules about. Please tell me what this is? I found and removed two leeches much larger than this a few months ago so I don't think they are leeches. Only fish in the tank are pygmy corydoras.