A closer look at aquarium white worms

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ccebr

Candiru
MFK Member
Feb 16, 2010
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[YT]sWq7Tz0vq3I[/YT]http://www.youtube.com/watch?v=sWq7Tz0vq3I
This was filmed through the eyepiece of a microscope at x4 magnification. There are thousands of these in my freshwater aquarium, rarely seen until after a water change, or after the filters have been temporarily turned off. I have identified them as "true worms" from the sub-class "Oligochaeta". I have not yet been able to identify to family level as I need to aquire the specific taxonomic key, and a higher magnification microscope. They are free swimming, rarely seen on the glass, and I beleive they inhabit the filtration system, feeding on fish excrement and leftover food. They are typically 3-5mm in length, round and segmented, with chaeta running down the lateral sides at each segment. This is certainly not "Planaria", which is a flat-worm from the class "Turbellaria", also commonly found in aquariums.
 
Are they really platinum silvery looking when you see them with the naked eye in your tank? I see these little guys all the time when I do W/C or clean my filters just like you... always wondered what they were
 
ye a pure white colour. These things appear in their hundreds after a water change. still working on an id.
 
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