Tank of doom :-(

Having some serious problems with fish deaths at the moment, and really
running out of ideas on how to stop the deaths.

Problems started a couple of weeks ago, when I had a couple of golden
mollys die the same day. My immediate reaction was to do a partial water
change, (30%ish), and cleaned the pump filter using tank water (I never
use untreated tap water).

As a precaution, I have been putting a general purpose antibiotic, Myxazin
for the last week, and after each partial water change, I have added some
cycle (Nutrafin)

Anyway, since then, the fish have been going on a regularish basis. By
the end of last week, another 3 mollies had gone. I did a Nitrite test,
and it looked pretty reasonable (0.3 or thereabous). Since then, I have
lost all 5 neon tetras.

Yesterday, I did another partial water change (30%), and put some cycle in.

None of the deaths, I have seen the run-up, but today, I found one of the
fish (tangarine tetra) having trouble keeping balance, swimming all over
the place, finally resting in the plants. A poke would send it off into a
untrolled frenzy. I took the fish out, and put it in a seperate tank. A
few hours later, another one exhibited the same problem, I moved that toa
seperate tank also. Both fish have now met their maker...

Anyone have any other suggestions. Uptil the fish die, they all seem
healty enough, eating and swimming fine, with none of the obvious
symptoms..

Need help before the remaining 8 or so established fish go the same way as
the others... Whats interesting, is that these fish seem to be dying in
order of "newness", followed by type.

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