I read your other posts but couldn't get from them what exactly it was that killed your fish, except that you were not doing regular weekly water changes, sometimes going out to three weeks.
I posted before wondering how one would know when a fish was done for, and it was time to be humane. People seemed to think I was thinking of giving up fishkeeping.
At the time, I wasn't.
Now though... I'm thinking perhaps I should.
My life isn't condusive to doing weekly water changes. I do changes at 50-70% when I do them (which I think is proper), and I've always shot to do them bi-weekly. This usually translates to a week and a few days, about 65% of the time. The other 35% of the time, it translates to two weeks. In the past two and a half years, it has translated to about three weeks, less than ten times. (Perhaps I was overly honest...)
But now and then... it will be three weeks. More often than that, sometimes it will be two weeks. Not usually, but.. often enough.
I've never had issues with my fish dying, much less ALL of my fish dying... not even anything even close to this. I fully expected to be berated for not having a quarentine tank... I truly thought the two small fish I added about three or so weeks ago carried something in.
My readings have always been good... even at 3 weeks out, my nitrates spiked to about 30, but that's been the only issue.
To learn that not only am I doing it wrong, but my other tanks are also ... laying wait for this same scenerio to happen...
is disheartening to say the least.