Hi Everyone, I have 2 tanks - one is a 10 gallon with only a betta and the other is a 55 gallon with 2 keyholes, 1 gold severum, 3 rainbows, and 5 black neon tetras (I am switching tetra types and just letting the school die out - so I don't want to add to it - would love to get a rummynose school - we'll see). I have an aquaclear 100 in the 55 gallon and an aquaclear 20 in the 10 gallon, but I also have a lot of extra media in both. Have had both tanks for about 1 1/2 years. I do water changes between once every week and half to once every two weeks. Not really planted but I do have 1 plant in each tank and they are very healthy. My question is, why do I keep getting 0 amonia, 0 nitrites and 0 nitrates? The nitrates are especially concerning. Yes, I shake the nitrate bottle number 2 for up to 3 minutes and I even bought a new test kit thinking maybe the older one was just too old, but readings are the same. Fish look healthy. What could it be? Mini cycle? I've been getting these readings for a while now, a couple of months. To be honest, before that I had not tested since I knew the cycle had been established. Any thoughts???? Thanks!!!!