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Old 12-05-2012, 06:41 PM   #9
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Personally other than the first several months I don't think flow is particularly important. Initially you need good flow to move as much as possible through the various filter medium since there is really no other filtration. Once the tank is established, most of the filtration (bio) takes place within the tank itself through the plants and substrate and other places of bio filtration. A gentle flow is all that is really required for most setups IMO.
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