In the list "Aquariomagia" (in Portuguese) someone asked for means to reduce nitrogenated compounds in tanks, than I remembered of an article in Aquarium Fish Magazine (Lee Newman, June-1997, 9(6), pp. 34-43) on a filter system based on terrestrial plants (in the case "Brazilian swords" - Spathiphyllum sp.). I tried this system with a breeding tank of Oscars, with good results. Someone else knows this system and/or have tried anything like this? or have any comments? Zeco http://sites.netscape.net/zecocarvalho/ ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!