So, I replaced my filter since my old one wasn't working, the tank hadn't been cycled but it has fish. (Really long story, not my choice, if you would like an explanation I'm happy to give one.) So of course I'm stuck having to do a fish-in cycle. Tank is overstocked slightly, 6 phantom tetras (which I'm hoping to rehome very soon), 2 cories (I'm aware they need schools of 6 but I cannot in this tank and will be rehoming them) and a betta. The tank is a 12gal cube. Anyway, I've done two tests since the filter was replaced Yesterday: 0/0/0 Today: 0/0/0 I replaced the filter about two days ago, I haven't done a water change since I replaced it. I just find it odd that with this bioload, the levels are so... Low. I know that cories have quite high bioloads, then I believe it's tetras, with bettas having quite a low bioload. Could it be that there's ammonia present in the water but it isn't enough to show on the readings? I put the nitrate and ammonia side by side since both 0 readings are a yellow colour, and they look pretty similar. Anyone have an explanation for this? Clearly the tank isn't cycled. Either I'm colourblind or there's really nothing in the tank at all. I haven't even seen a bacterial bloom or anything. It's odd. I've cycled tanks but usually I do have ammonia present, especially since my water has chloramine which produces ammonia when removed. (My conditioner removes chlorine and chloramine) Is this normal?