aquasam
Aquarium Advice Apprentice
I decided to take the substrate out of my 10 gal cory fry tank ... after doing so and vacuuming .. I was gazing at the tank and slowly noticed these little slits sliding along the glass walls ... on closer inspection I begin to realize that there are many of these ... of all sizes cruizing along pretty fast along the walls ..... what are these strange worm type things .. any ideas .. ??