Hi, everybody. I just tested my water parameters (I like to make sure everything is good). Ammonia is at 0, Nitrite is at 0.50, and my nitrates are around 5-10. My tank is 60 gallons with only 6 Zebra Danios in there. The filter is a AquaClear 110 if that makes any difference. Its been set up for a couple of months now (maybe 3?). The nitrogen cycle was supposed to be finished some weeks ago too as I had no nitrites before. I did my weekly 25% water change yesterday. I didnt know my nitrites were off at the time. Will this harm my fish? As in, is this an emergency? What should I do? Could it be that they are being fed too much? I feed them tropical fish flakes. Ive never had a problem with nitrites but Im thinking that it could be overfeeding. Last week, I was out of the country and someone else fed my danios. I told them how much ( I give them around 3 or 4 flakes) but when I got back, I asked them how much they had actually been feeding them and they said around 10 flakes a day (WHAT?!). In my book, that is overfeeding. But I could be wrong. Could that be the cause of the nitrites? Do I need to do a water change? Yes, Im freaking out. And yes, I may be overreacting. Thank you.