Unexpected fish deaths

[lance lyon]

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

---
- 0rigin: 42 Degrees South +61-3-6297-8499 (3:712/313.1)
---
þ RIMEGate(tm)/RGXMod V1.13 at BBSWORLD *

[Rick]

"lance lyon" > wrote in message
news:1116902821.732.205.6895048.1960961286.RIMEGat ...
>
>
>
>
>
>
> 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
>
> ---
> - 0rigin: 42 Degrees South +61-3-6297-8499 (3:712/313.1)
> ---
> þ RIMEGate(tm)/RGXMod V1.13 at BBSWORLD *


6 comets, as in goldfish??. One comet, max two in your size tank is all that
should be kept. I would suspect that an ammonia spike killed the fish. Not
likely that whatever filter you have on that size tank can have a bio load
capable enough of handling 6 comets. Messy fish that create large amounts of
waste which = ammonia spikes. Strange that the catfish didn't go also.

Rick