I started a fishless cycle the beginning of July. I got the ammonia up to 3PPM and was monitoring it until I unexpectedly became hospitalized the first week of July. The third week of July when I was released, the ammonia was still showing as 3PPM and no nitrites...I wasn't sure if I missed the nitrite spike when I was hospitalized. I waited a week or so and tested again - this time it showed zero nitrites but slight nitrates. This led me to believe the tank was cycled. Saturday I did a huge water change as directed and waited 24 hours. The ammonia is STILL 3PPM....????? How? I used fresh, treated water. I have had fish for years but have never attempted a fishless cycle, so this is over my head. I cannot figure out how there is so much ammonia if I changed out most of the water. Again when I check, it looks like slight nitrates and no nitrites. I have a Betta and 2 snails that are waiting for this tank. I would appreciate any assistance in getting this ammonia down. Thank you!