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I had some extremely strange fish deaths last night.

At about 6:30pm I noticed the two largest fish in the tank were acting a little strange, nothing crazy but the odd flash from the 5 1/2 inch Venustus had me watching carefully. 3 hours later, both the 8 inch Tandanus and the Venustus were dead :eek:. It seemed the Venustus had been dead for at least an hour or more longer than the Tandan. Now, at this stage I tried to work out wtf went wrong. I had done a water change, it was a hot day, I added fine foam to the filter and the powerhead had stopped working overnight so I had to give it a whack to get it working again.

Now, the first thing I noticed was that my male guppy culls were all swimming around in the tank seemingly unfazed, which seemed weird as these two larger fish were dead as door nails. Anyway I measured and examined the dead fish...

*May not be for the overly squeamish*

I noticed the Tandanus was very, very plump, so much so that I could have put its death down to bloat. So out came the fine scissors and I opened up its stomach. EGGS! Heaps and Heaps of EGGS! I estimated between 600 and 900 eggs in total contained in two individual eggs sacks. The eggs were mostly very well developed with some not quite ready for laying, they were very large for the size of the fish. Why the hell did an 8 inch Tandanus cat have sooooo many eggs?

Well, after wrapping my head around that I proceeded to dissect the venustus, EGGS AGAIN! Only a very small amount of underdeveloped eggs here but healthy looking none the less. Interesting. I removed the filter foam at this point, assuming it was leeching a chemical of some kind.

So I chucked 1/2 a dozen more male guppy culls in the tank along with 3 females and left them for the night. Next morning... ALL 3 FEMALES DEAD, males seemingly unfazed. I didn't examine the female guppys as they are two small for me to analyse properly with the gear I have here.

In summary, something only killed off the female fish in the tank. Both developed eggs, the Tandanus developed a grotesque amount, seemingly in the hours before dying.

What could have caused this? Any body experienced similar? ATM I have put it down to chemicals in the foam but I am unsure.

*Can post pictures of the whole fish and the Tandanus eggs if anyone is interested.

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Do you think maybe that the Venustus was laying infertile eggs (without the presence of a male) and the tandanus was eating them? I doubt highly that it (the disease) is targeting female fish only, although that's the way it's happened by chance. I don't have any suggestions to what it could be but just another thought regarding the eggs.

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I think what may have happened , is the bigger fish ran out of oxygen, it was hot ,you did a water change , filter broke down , all with new water, sounds like maybe new tank syndrome or just the lack of O2.

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[MENTION=2304]Eric A[/MENTION] Hadn't noticed any breeding behaviours from the Venustus. The eggs in the Tandanus were definitely its own eggs, they weren't in the stomach.

[MENTION=2383]ageofaquariums[/MENTION] Yeah I need to do a water test asap. Oxygen should have been alright as it had been 40 odd the few days before as opposed to 35 that day. Overdosed on dechlorinator, if dechlorinator can lose its effectiveness over time that may have been it, although I couldn't smell that typical "chlorine" smell. Temperature was 27, have had the tank above 30 b4 with no issues.

[MENTION=8119]jase[/MENTION]86xub Yeah that was it. Its a 4ft I chuck my culls in. Believe it is better than passing around substandard fish.

[MENTION=15371]Delapool[/MENTION] Cheers, might relate to my situation, will keep it in mind.

[MENTION=5418]thatsright99[/MENTION] Culls read comment above.

[MENTION=156]hareysfish[/MENTION] very well could be oxygen but they have definitely lived through worse in terms of temperature. Only did approx 30% water change. Tank gas been established for over 1 year, about 1 and a 1/2 years I think.

Other guppies are still fine. I really feel like it was something in the foam. Only thing is, why wouldn't it affect the males? Hoping it was just oxygen and the size saved them. I hadn't lost a fish for 4 or more years so its a bit shocking to have something go drastically wrong.

The foam was made for aquariums in particular :-(

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Dechlorinator will lower the oxygen level in aquariums when dosed at above normal levels, especially the ones that also bind ammonia. As to temperature, prolonged elevated temperature can cause deaths as can sudden fluctuations.

A combination of factors can cause what would normally be non lethal to cause casualties.

Low surface agitation + warm water temps + slight ammonia spike + dechlorinator overdose = larger fish dying from inability to get sufficient oxygen.

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