I have done 2 major water changes yesterday, and today because my tank has been at super high nitrites and nitrates for a week now. And they dont seem to be going down, can anyone tell me why ? This is going on to the 4th week of cycling. The third week nitrites and nitrates were present, super high. My ammonia is being processed under 24 hours, maybe even less. My tank is a 125 gallon.