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River Tanks
Everything you need to know about River and Riffle tanks
River Tank Ecosystem
Ron Beaudry wrote this great three part AquaLink column about River Tanks. If you are interested in River Tanks don't miss it. The author includes addresses for additional information and offers to answer questions himself.
The River Tank(tm): A Versatile Tool for Teaching Science
Christopher H. Randall from Northeastern University in Boston, describes how a River Tank can be used to teach biology and chemistry classes. A very detailed site that describes how to set up a River tank, explains how the ecosystem supports itself, and lists suggested reading.