Any opinions on this? Looked at calendar and got a more detailed timeline, the new fish were added on the 20th, prazi added 7 days later, 5th day after prazi first old fish died now 2nd fish. Is it possible that there was ammonia spike then nitrite spike that went down and caused fish to die AFTER this? Then a nitrate spike that I noticed yesterday and went down today? I don't test nitrate regulary but when I do its always been zero. So I'm thinking something caused it to spike but not sure if a ammonia and nitrite spike is only thing to cause it. If this is possible I'm sure the prazi didn't help. Any thoughts