04-08-2007, 12:25 PM
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Four items to note:
1) You did not indicate the type of water which you are using for WC's but if you are using tap water the nitrate concentration in your tap water may be the culprit.
2) Hopefully your ammonia and nitrite concentrations are 0 otherwise the nitrates are being produced by bacteriological digestion.
3) Please note that after 10 10% water changes 35% of the original water and it's impurities still remain in your tank.
4) Plants utilize nitrates as nutrients.