I will have to stop and get more gravel tomorrow. I would have thought that this tank would have cycled by now.. it has been almost 6 weeks. I have a undergravel filter with a powerhead on it.. I also have a marineland 350 bio wheel running. now I did change out the filter about 2 weeks ago to the 350. I had a bio wheel 150. but my LFS said that it shouldn't have that big of an impact on the cycle because of the undergravel filter at work. Most of the good bacteria is supposed to be in the gravel in the first place right? I don't siphon the gravel when I do water changes