Help!.. Genocide, Julidochromis self destructus

MrHappy wrote:
If less than 0.1 PPM is a nitrite spike, you must be a startling
fish keeper
I would sell my house and all my possessions to hit less than
0.1PPM with dead fish in the tank

You missed the point, wildly. Just because it was only 0,1ppm when he
measured it does not mean it was always only 0.1ppm. In fact, I would
wager it went well above that amount before the OP even got home. When
that whole tank of mine died off, I got 6ppm ammonia in under 3 days. This
was rather quickly (within 3 days) converted by the bacteria colonies
(remember the bacteria just has to grow to be sufficient for the ammonia,
so it happens much faster with a previously cycled tank than with a real
cycle where you start from almost nothing). The subsequent nitrite spike
was also converted into nitrates within a few days. And I removed all the
dead fish before there was any decomposition to the bodies, although the
food the sitter kept dumping in probably were a good part of the high
ammonia levels.

So, considering there was noticeable decomposition of the bodies in the
OP's tank, I would imagine the fish had been dead for several days by the
time he returned. Thus he would have missed measuring the magnitude of the
original ammonia and nitrite spikes. Just because he wasn't there to
observe it doesn't mean these spikes didn't cause damage that caused the
subsequent deaths. So, that was the point of my post. The fact that there
was any measurable ammonia and nitrite currently suggests there was a far
larger spike before he came home which could very well be the reason his
fish are still dying.