hello all.I'm alil stumped. First, my ammonia levels continue to drop....today when i got home it was @ 0.So I checked my nitrItes which are still very high,then doesd to 2.0mg/l. But when I check my bio filter, It's clean, save for a small brown patch on one side.Is'nt this where the bacteria is suppose to be????? I have a whisper power filter(it hangs over tha back of the tank)the filter still has carbon in it,could that be why I dont see any bacteria??? I'm about 6 days into my cycle and I have a 35 gal tank.