Because I recently bought a betta I decided to try and make use of an old 10 gal I had previously failed with years ago. At the time I didn't know about the nitrogen cycle and sadly the goldfish I had at the time all got sick and died. Because they died of illness when I started up the tank again I decided to wash everything, with soap, because I didn't know how bad that could be. Well i'm honestly pretty sure I removed all the soap by thoroughly rinsing everything but since I haven't been able to get a proper nitrogen cycle going I wanted to know if maybe there could be some soap that's ruining it? I've tried to get a fishless cycle going for over 3 weeks now, the water is properly dechlorinated with aquasafe and the ammonia levels were constant at about 3.0ppm. There was never any increase in nitrite at all so after all that pain I thought maybe I was doing something wrong. I emptied out all the water. Bought new dechlorinator since I thought the old one might have been too old, and I even bought tetra safestart plus. I refilled the tank with fresh treated water and added the tetra safestart, It's been about 4 days now since then and I still notice absolutely no change in the nitrite level. considering at this time i've now added live bacteria and still see no changes i'm really wondering where i've gone wrong. Is it possible there could be traces of soap still in the substrate that is ruining the nitrogen cycle? Does soap even impact the nitrogen cycle? All I saw about it online was that it could be toxic to fish, nothing about cycling. My fish has been patiently waiting in a vase that i've been frequently changing the water in waiting to be introduced to the bigger environment. I feel really bad for him so please help me out to figure out what i'm doing wrong here! Many thanks!