Ya, I ask because I've had a fish die 2 days ago. I added about 8 pounds 2 weeks ago. Now I have ammonia showing up and my banner fish is twitching and acting funny which is what the lavender tang was doing. Right now it's showing ammonia .5, nitrite 0, and nitrate 20. My salinity was at 1.028 which I brought back down to 1.025, don't know if that salinity may have caused it or something else. I've been getting the ammonia down with water changes, so far I've done about 25%, which is helping but he is still twitching.