Hello, I've been having a problem. My nitrites keep going up in my tank. I did my weekly 10% water change and tested it a day later and my nitrites were still high (1.0) the day after. I don't have many fish or plants in mine. It's a 38 gallon with 2 small cichlids, 2 cory catfish and a pleco. Other than store bought decorations and gravel, there is 1 live plant and 1 moss ball. Anybody have any idea why the nitrie level is spiking? (Also I don't overfeed, I only drop a couple of pellets a day for them.)