I've been trying to cycle my tank after inheriting (rescuing, really, but it's a long story) a fish with no fish knowledge. I learned about the nitrogen cycle and have been diligently trying to be patient and do it right, which has been stressful since its a fish-in cycle. I started with a 2 gallon tank, not knowing tim later that it's too small, but I wanted to get the cycle down pat before attempting it on a bigger tank. Well it's been about 3 weeks and I was possibly getting close and I was getting frustrated because when I'd pour in new water, noticeable particles/debris would kick up from the gravel. I could clearly see things were floating around and it was bothering me so much. It got to the point where I was changing so much water to try and get it clean and no matter what debris would kick up from the gravel. So I took the fish out and did a 100% water change to finally feel like it's *clean* and my fish is not swimming around in dirty water. I know a tank needs bacteria so I didn't do any scrubbing or actual cleaning, just a 100% water change. Did I completely and utterly crash my cycle? The filter has never been changed/cleaned (when should that happen by the way...?) and I didn't clean the things that were in the tank like his hidey place and fake plant. But afterward it occurred to me that I've never seen any talk about a 100% water change and only then did alarm bells go off. I was just so discouraged and worried about the water. Am I starting from scratch?