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Male Convict.                                   Harlock, the Green Terror, after the crash.

that, if anyone were likely to survive, they    what may well be a colony of parasites that     added them to the tank. What’s the worst
had the best chance. With that, I set up        I will now wait out the next three weeks, to    that could happen? I really hadn’t imag-
the 25 litre hospital tank, and pulled them     make sure that they are all dead before I try   ined “the worst” would mean “wipe out my
out to be monitored and treated. My oldest      to start the tank up again.                     entire environment”, but yes, that is exactly
Convict, I had to leave him in the big tank,                                                    what happened. Was it just the introduc-
and hope for the best. Alas, the end came         Many things have been going through           tion of the fish? If that’s the case, why were
for him too, last night.                        my head since this all happened. What did       they not sick? Why did none of them show
                                                I do wrong? The answers are telling. Most       any signs of the disease? Could there have
  As of now, there are no fish of any kind      critically, I broke one of my most important    been another potential cause? Yes. Pretty
in my main tank. They are all dead. As of       rules, and I did it out of impatience. My       much all fish carry parasites. It comes with
this morning, my two Green Terrors are          hospital/quarantine tank wasn’t set up. It      the territory. “Ich” is expressed when fish
still holding on, one looking like it might     hadn’t needed to be for some time. I was        have a stress episode, and those parasites
be a hard recovery (he’s lost a fair amount     not prepared, and I didn’t have the neces-      are excited and activated. They then push
of scale over the left side of his head and     sary materials in place. Cautious, intelligent  out of the fish to reproduce and look for
flank), and the other having what looks like    me would have set up that tank first, and       new hosts. Could the two large-scale water
a real fighting chance. My 25 litre tank is     would have let it cycle for three weeks,        changes in less than two weeks have con-
not much, it’s definitely not the environs I    then bought new fish, and had them wait in      tributed to that? Well, yes, potentially.
just pulled them out of, but it will have to    the quarantine tank for three weeks, before
be home for the next three weeks, and on        introducing them to my main tank.                 The fact is, water pH is probably the one
the plus side, they are currently still alive.                                                  thing, outside of ammonia or nitrite spikes,
For the first time in 19 years, though, my        Instead, because of a moment where I          that will most stress/affect a fish. I try to
main tank is now devoid of life, except for     was making a major change in the ecology        keep the pH as close to 7 as possible, but
                                                of the tank, I figured “why not?”, and I just

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