I have been testing the water for the past week and the ammonia is at .25, the nitrite is at zero and the nitrate at 5. Because the ammonia is above zero I would do a 25% water change. My question is should continue to change the water at these levels or let the cycle process continue? I have had my tank upgranded (all was new filter [sponge], etc) and running since Jan. 16, 2005. If I do not continue to change the water will the ammonia over time go down to zero and then the nitrite will begin to rise? If this will be the case (ammonia = 0 & nitrite > 0), only then should I start doing the 25% water changes again? Is siphonning the waste from the bottom during each water change a good idea or does it slow down the cycle proceed? Do you recommend I only siphon the waste when the tank is cycled or during each water change? Thanks, Mario D.