what is chaeto

There is a picture of a handful of chaetomorpha in this article: http://www.advancedaquarist.com/2005/3/lines

It looks like a green "Brillo Pad." It does not have holdfasts, is not invasive, and does not need substrate or rock to cling to. Since it can act as a mechnical filter in circulating water, I rinse the chaetomorpha whenever I perform a water change.

I would only order it from a local fish store. Every time that I have placed a web-order for macroalgae, it arrived with a pest, such as aiptasia anemones or caulerpa.
 
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