Hi all, My problem is the following: having a lot of nitrates, may I do water changes (every 15 days) with RO pure till will not decrease? My tank is 40g with yaest CO2 and Tetra drops for plants. Thks & rgds -- Ciao Ezio _ _ ______________________,,,_o o_,,,_______________________ - FERRO Ezio Torino - Italia Quando il gioco si fà duro, è il duro che inizia a giocare. _________________________________________________________