i have been testing my water for amonia, nitrite and nitrate.... amonia is zero, nitrate is 10 and nitrite is 0.5 i have been changing 25-30% everyday and currently have a 60 gal tank running on xp3 (capacity up to 175gal). i cycled the tank for 2 weeks, dropped some stress zyme for biological filter. i only have 4 3" blue pleco and 2- 4" thin bar datnoids. it is bare bottom. i am wondering how can the nitrite be that high with very little fish in it. does this mean my filter is not doing it's job??? do i need to used gravel to increase the bioload? help please!!! 
