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Fresh Water Reef

 There has been some discussion on the list regarding freah water reefs and terestrial plants as filters. I have decided to setup a 10gal test prior to a 40gal main tank later on. I am thinking of using Spathphyllums as the filter plant in the outside container and have found a sm
grained fired clay product used for growing hydoponic orchids to use as the medium. My question is the exchange rate to and from the outside container. Should the water trickle in and out like a hydroponics system via a lift tube arrangement or pour in and out from a powerhead like
an outside filter? If the latter, can the Spaths tolerate having their roots constantly submerged? Or would a bog plant like Marsh Marigolds be a better choice as the filter plant. I would think that you would want a plant with a fairly high metabolism as the filter plant. Anyone
have any experience with this? Thanks much.