Unexpected fish deaths

Hi ppl's,

Around two weeks ago I added 10 fish (6 comets & 4 small catfish) to a new
aquarium that had been cured for around six weeks.

Last Saturday, the water started clouding, so I did around a 30% water
change (this is a 60 litre tank). Almost immediately the Comets startedto die
with the last one going off this morning.

Curious thing is, the catties are totally unaffected.

I use a very coarse gravel over a UG filter as well as an external "hang on
the side" filter. All water tests are fine, PH is fine, nitrates & nitrites are

non existant, so the bio filters seem not to be the problem. The cloudiness
has also gone as of yesterday.

The water I use is rain water (we are on tanks here) & this has not been an
issue with the other tank (I'm in Tasmania, Australia - so acid rain doesn't
even figure into the equation).

Just can't fathom why the Comets have died (they are usually very robust) & the

more "fragile" catties have survived ok.

Any thoughts ?


cheers,

Lance

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