02-13-2008, 04:32 PM
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Umm, yeah, that is really strange. I haven't experienced this myself, so I really don't have an explanation for it, maybe someone else does?
Since there isn't any ammonia or nitrites in the tank, I guess the best thing to do would to continue to monitor the water parameters daily. As long as he's still active and eating I wouldn't worry, it should work out in time, and you'll know if anything spikes because you'll be testing it every day.
Yes, definitely go ahead and add more water. It's fine to keep the water level up, just make sure you use dechlorinated water that's the same temp as the tank (I know you know this).
It's possible that you have so much new carbon in your two filters that it's been getting rid of everything in the water? I really don't know if that's possible, but I do know you have some pretty heavy duty filtration going. Perhaps when the carbon ages in a week or so, the tank will begin to cycle? Just remember: never change both filter cartridges at the same time.