#19
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Quote:
Another problem you see often is the buffering effect of having two bodies of flow directed against one another, e.g. two powerheads pointed at one another from opposite ends of the tank. This not only reduces overall flow momentum, but creates shearing forces where the bodies meet. This uncomfortable zone is easily reflected in motile animals becoming stressed and/or feeling the proximity of these shearing zones (anemones will often vacate these areas). HTH
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