For the last three days my ammonia has been at .25 in my 15 gallon tank. Other readings: Nitrite - 0 Nitrate - 10 pH - 7.6 I have done two 25% water change with adding water conditioner. I don't know if I messed up my cycle or what. But the last 25% water change that I did my angelfish started acting weird. They were just swimming at the top for probably a good 4 hours after the water change. Their behavior is back to normal now but I don't know if the two water changes stressed them out. I'm scared to keep doing water changes in case it is stressing them out. Any advice? I'm wondering if I need to change my water conditioner and go get Prime since I hear so much about it. Also, my tap water tests at 0 for ammonia.