05-18-2011, 12:04 PM
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It's planaria of some sort. They're harmless, and actually a sign of a healthy ecosystem. (instead of the sterile petri dish that most aquariums are).
They COULD be a sign of overfeeding, (since they have to eat) so go get your water checked... If ammonia and nitrite are 0, and nitrate's less then 20, you're good.
Planaria Worms (small hair-like white worms)
Free-living, non parasitic flatworms are common in lakes, streams, ponds, and other freshwater habitats. Planaria, usually dark brown, greenish, or tan, are found in shallow water underneath submerged rocks or vegetation. They can glide over the surface of objects and are sometimes upside-down on the underside of water surface film. The body of Planaria is non-segmented and bilaterally symmetrical. The head is triangular shaped and contains two eyespots that detect light. Worms can shorten and change shape using muscle cells whose contractions are controlled by a primitive nervous system. Asexual reproduction allows a new head and tail ends to form by a process of tissue regeneration. Sexual reproduction is also possible after worms exchange sperm; worms are hermaphroditic. After internal fertilization, numerous zygotes are deposited into a small, dark capsule, called a cocoon, which is about 1 mm in diameter. The cocoon is attached to submerged rocks or plants and, after further development, small worms emerge from an opening in the cocoon. There is no larval form.
Last edited by redchigh; 05-18-2011 at 12:09 PM..