Why did it die

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the OPs' thread title was "Why did it die?" so everyone focused on the question, not condolences.
there could've been a combination of some different reasons.
 
seedubs1 said:
Youve only been here 5 months. Don't tell me to spend more time learning. I fully understand the chemistry behind nitrification and how nitrifying bacteria works. It would take more than not servicing a filter for 1-2 weeks as posts in this thread indicate to cause this type of damage unless the tank is horribly overstocked/under filtered in which case you have other issues to worry about.

Thanks for your awesome insight. But this is almost definitely due to no oxygenation for 12 hours. Op also said his parameters were 0/0/20, indicating he didn't have his tank under filtered and his filters likely weren't too bad. Try reading the thread before posting next time. Kthxbai
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If no circulation/flow to dissolve oxygen into the water for 12 hours is enough to completely deplete the oxygen in the water to the point where the fish would die then how on earth do they survive being shipped all over the world stuck in tiny bags for 12-24+ hours??

I'm not sure why you're talking about nitrifying bacteria as that isn't the issue with dirty canister filters being switched off. The problem is that with no circulation a canister full of crap soon becomes an anaerobic environment and starts producing some pretty nasty stuff, similar to a deep sand bed that gets waste trapped in it and releases toxic gasses when disturbed. The good parameters don't mean squat other than that he has done a large water change recently, a filthy canister can still keep the nitrogen cycle going quite happily as long as the water keeps flowing through it, but it will produce more nitrates if the waste isn't removed periodically. I have seen first hand with my own aquarium what a poorly maintained canister will do when left switched off for too long. Many years ago I left mine off (the tank was filtered by a sump also, the canister was just a little extra) for nearly a whole day after a water change, that evening I noticed it was switched off and turned it back on, came back a few minutes later to find the fish gasping and looking pretty unhealthy. Another big water change and a thorough clean of the canister and things were back to normal. In this case the OP has said he has never opened his canister as he wasn't sure how to put it back together, so it is [IMO] highly likely that it was full of physical waste inside, meaning that when switched back on after 14 hours stagnating with no flow it dumped a heap of toxic stuff into the aquarium.
 
petspoiler said:
the OPs' thread title was "Why did it die?" so everyone focused on the question, not condolences.
there could've been a combination of some different reasons.
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I understand what you are saying but we still can be respectful. I also agree with you because there are really so many variables that are left unanswered to narrow the conclusion down accurately.


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David R said:
If no circulation/flow to dissolve oxygen into the water for 12 hours is enough to completely deplete the oxygen in the water to the point where the fish would die then how on earth do they survive being shipped all over the world stuck in tiny bags for 12-24+ hours??

I'm not sure why you're talking about nitrifying bacteria as that isn't the issue with dirty canister filters being switched off. The problem is that with no circulation a canister full of crap soon becomes an anaerobic environment and starts producing some pretty nasty stuff, similar to a deep sand bed that gets waste trapped in it and releases toxic gasses when disturbed. The good parameters don't mean squat other than that he has done a large water change recently, a filthy canister can still keep the nitrogen cycle going quite happily as long as the water keeps flowing through it, but it will produce more nitrates if the waste isn't removed periodically. I have seen first hand with my own aquarium what a poorly maintained canister will do when left switched off for too long. Many years ago I left mine off (the tank was filtered by a sump also, the canister was just a little extra) for nearly a whole day after a water change, that evening I noticed it was switched off and turned it back on, came back a few minutes later to find the fish gasping and looking pretty unhealthy. Another big water change and a thorough clean of the canister and things were back to normal. In this case the OP has said he has never opened his canister as he wasn't sure how to put it back together, so it is [IMO] highly likely that it was full of physical waste inside, meaning that when switched back on after 14 hours stagnating with no flow it dumped a heap of toxic stuff into the aquarium.
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You make a very valid point point with the first paragraph, which is why I am a little skeptical with no oxygen especially when only one other fish died and nine or so survived. Although I guess the largest fish died which would probably consume and require the most oxygen, but this still seems not necessarily plausible. The filter certainly seems questionable.


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Correct. And notice I didn't come on here telling you to go learn more before posting your opinion. Aquaticfan did that, and I don't respect his forum etiquette. Hence my follow up post. I posted my opinion, he replied with quote and acted like a jerk. He's only been here for 5 months, and he's acting like that? I'm going to call him out for sure. Feel free to do the same for me if I quote you and tell you to go read a book and learn something.

I still believe it to likely be lack of o2. Water is moving around and sloshing when fish are shipped, and they should be shipped with o2 pumped into the bags. There shouldn't really be any issue with oxygenation if they're shipped correctly. A tank that sits for 12 hours is stagnant unless disturbed. Completely differnet circumstances.

But...I can see your point that it could possibly be from toxins from built up waste. I just like to think that people on this forum keep their filters a bit cleaner than what would be necessary for this to happen as it'd require pretty gross conditions for that to kill fish after only 12 hours.
 
When the power's out and fishes like this which needs a high oxygen water tank is on it, I usually just go and take my siphon and let it go rounds and rounds... which would be a temporary solution for the oxygen problem...
-people now debating and here and fro for what cause the fish to die, for me it's really your canister.
 
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