Sudden Death Of All Tank Inhabitants...

EschTheEel

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It is too late to help the poor fish who have now passed away, but my hope is that someone will come forward with knowledge about what possibly happened in the tank. I want to know what went wrong, and how to prevent it from happening again.

Earlier this week I went camping, and had left my mother in charge of the tank. All of the fish seemed to be doing fine, however now… It seems as though something was definitely wrong.

Tank size: 10 gal

I do not have any water testing supplies of my own. We do take a trip to the pet store ever week or two, and bring with us a sample of water to get tested there. We were told the last time we went, about two weeks ago because of camping, that the water was within good parameters. However, seeing as all the fish are now dead, we will be taking in a sample today to see just what the heck happened, in case something rapidly changed.

Tank temp: The temperature had been kept steady at 80 degrees, however when I returned home from camping it had shot up to 84/85. Turning the heater down didn’t help, and so I unplugged it. However, that did not lower the temperature.

Fish Symptoms: The fish showed little to no symptoms before death. When I came home, my mom told me that I had lost a zebra danio and she thought a shrimp. Her eye sight is bad, and so she did not remove what she correctly assumed to be a shrimp corpse, in case it wasn’t what she thought it was. Yesterday in the afternoon, I noticed another dead danio. While scooping him out, I found the dead shrimp (could this dead shrimp, left in the tank too long, be the cause of all this death??), and had to move the log to get at him – under which I found my pleco, also dead. The other fish in the tank seemed to be doing fine, however we decided we were going to do a water change today (since we were very busy yesterday). This morning, I wake up to find my three other danio floating at the top, and my beloved eel dead on the bottom. All of them had been alive and looked healthy the day before. It seems odd (though I don’t know, this could be normal…) but the danio looked like they had been bleached white, when just yesterday they were full of colour. The eel, however, is the same colour he always was.

Volume and Frequency of water changes: 15% to 20% water changes every week or two, depending on schedules. Today, as I said, we had another one scheduled, about a week and a half after the last.

Chemical Additives or Media in your tank: None, except the small layer of rocks at the bottom of the tank.

Tank inhabitants: It was previously home to five zebra danio, a peacock eel, an albino pleco, and two ghost shrimp (I am unsure as to the second’s survival, though his state will come to light when we clean out the tank…)

Recent additions to your tank (living or decoration): The newest addition would be our pleco, about two and a half weeks ago, perhaps three.

Exposure to chemicals: I am not sure if this would ‘count’, but recently we were told by the pet store that it might be a good idea to use distilled water instead of tap. They said it might be easier on the fish after our recent move. We were slowly changing the water, adding distilled during our water changes instead of using tap water, like suggested.

Extra information: The tank has been set up for going on seven and a half weeks now. We just recently came home from college, thus the move. I don’t feel like it was a cycle problem … In the dorms, the tank had been set up around nine weeks before the move. About three, maybe four weeks into that first cycle we had a touch of ich, and treated it accordingly. The tank was ‘cured’, and none of the fish showed those ich symptoms this time around either. I know it would be convenient to blame the eel for being aggressive – but over these past months we have watched him at all hours, and he has never been any type of aggressive to any of the fish – in fact he always befriended the pleco. Not only that, but the dead fish show no signs of being attacked that I can see (and, even if they were, it is highly unlikely Esch would beat himself to death…).

While it is too late for these fish, and we are heartbroken over the loss of our baby (the eel), I still would like to know just what happened. I want to know if there is something in our tank, rocks, or décor that needs be treated before we even consider putting any other fish in the tank.
 
1st off - get a liquid testing kit ASAP (API will do). Dont get the strips; get a liquid testkit!

2nd - check your heater; could it have malfunctioned (resulting in a temperature drop/spike)?

3rd - when you do your water changes, do you condition the water before adding it? It could be that your tapwater contained a certain PH value (eg. 6.2); with the distilled water the PH is generally neutral........ as far as I'm aware, a sudden PH change can be catastrophic in a community fishtank......

Make sure you test the PH of your distilled water against that of your tapwater, and post your results.

Sorry to hear about the fish (and the eel) mate =/
 
Here are some pictures (I am sorry for the poor quality - all I have is my phone, my digital camera is missing :/).

Two are of the eel, another of one of the bleached looking danio, and another of what looks like some clear, almost milky, long and flowy growth that seems to be in the tank (I am not sure its the culprit either, though...).
 

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The other two pictures
 

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Sorry to hear about your loss of all your fish . Was your tank cycled ,my tank has been cycling for over three months ,and still isn`t cycled yet ?The ammonia and nitrite levels can higher over night causing problems for fish .within few hours my fish were going to top of water for air and 2 glowlight tetra died ,did an 60 percent water change immediately and saved remainder of my fish ,i now check water twice daily .Also 10 gall. is only approx. 37 litres,perhaps someone else can verify if this tank is too small for these fish ,but wouldn`t have thought this would cause the death of them srtaight away ,more likely to be high ammonia or nitrite . Hope you can sort the problem out,good luck.
 
I thought my take was cycled, but I guess it is always possible that it wasn't. I figure I will clean out my tank and start it going again, and hopefully do better with the tank next time around...

I'm not sure if it was over population that did it either. When we started the tank we were fish illiterate (and, I guess we still mostly are, but we're working on it), and we've had about the same amount of fish in the tank since the beginning. If it were overpopulation, I feel like it would have done them in much earlier.

Also, it is always possible the heater did have a problem. But, I unplugged it even, and it didn't seem to help :/ I am not sure, it could be that we just have to turn down the AC in the house...

It could be the pH, but we were trying to add in the distilled water slowly. Maybe we just didn't do it slow enough.

*edit* I forgot to mention, we did condition the water before adding it. We ever ran the tap water for a time before getting the water we were going to use for the tank, because I read somewhere metals and whatnot are more prominent in that first few minutes of water that come out the tap...
 
when did you add the distilled water?

Distilled water contains no mineral ions, they're require for proper osmoregulation, a sudden change in concentration of these ions will upset the osmorality resulting in osmotic shock.
 
when did you add the distilled water?

Distilled water contains no mineral ions, they're require for proper osmoregulation, a sudden change in concentration of these ions will upset the osmolarity resulting in osmotic shock.
 
We added the distilled water about a week and a half ago, about two or three gallons worth.
 
Yeah, they all just up and died in the past 24 hours, so I wasn't thinking it was shock from adding the distilled...

*edit* Well, apparently its not a complete tank death.... The last ghost shrimp just made his appearance, and seems to be doing fine (knock on wood). I plan to remove him, though, until I get some idea of what happened.
 
I would put a bet on it being caused by the plec overloading a uncycled filter myself; the ammonia probably just got to too high a level for the fish to survive.

It's very common for dead fish to go pale and grow fungus; that's normal (if dead fish can ever be 'normal'). I'd strongly recommend you buy your own test kits; fish-in cycles need twice daily testing for you to be able to monitor the levels.
 
But if it was the pleco, wouldn't it have effected the tank sooner? Rather than three weeks or so after?

We didn't mean to cycle with fish, we just didn't know any better. And, we probably will get a kit. Its just been difficult money-wise. Yeah, I know they're only 20 or 30 dollars, but... That's a LOT at the moment.

For now, we're probably going to just dismantle the tank and wait until we move back to school, then start cycling and testing when we get settled and get fish from there. I think its better for the fish and convenience all around. Moving fish wasn't really easy the first time around anyways, I'd rather put doing that off again as long as possible.

I just feel its such a shame that the eel would have passed after all he's held up through. He was a really good, surprisingly hearty fish.
 
But if it was the pleco, wouldn't it have effected the tank sooner? Rather than three weeks or so after?
It may well have taken thatlong for the ammonia to build up to a toxic level, especially if the fish were small, then the heater sticking on was the last staw.

We didn't mean to cycle with fish, we just didn't know any better. And, we probably will get a kit. Its just been difficult money-wise. Yeah, I know they're only 20 or 30 dollars, but... That's a LOT at the moment.
Oh, I do understand; I'm sorry if I sounded harsh; I wasn't blaming you one bit, we see people here having been given bad advice all the time!

For now, we're probably going to just dismantle the tank and wait until we move back to school, then start cycling and testing when we get settled and get fish from there. I think its better for the fish and convenience all around. Moving fish wasn't really easy the first time around anyways, I'd rather put doing that off again as long as possible.

I just feel its such a shame that the eel would have passed after all he's held up through. He was a really good, surprisingly hearty fish.
We'll certainly be here to help when you want to start again and I'm sorry for your losses; I know how hard it can be.
 
That is a good point. Its always possible my heater was the straw that broke the whole thing down before it could be fixed. I think before we even begin setting up a new tank, we are going to look into the heater, and more than likely end up getting a new one. I would hate for anything like this to happen again because of a bum heater decided to play not-so-nice temperature games.

I kind of feel bad for the fish. If we had known better we wouldn't have started with them. I especially feel bad for the eel. He survived quite a lot of uneducated owner abuse, and just took it like a pro, and loved us anyways - he even would play through our fingers when we'd do water changes, and liked us petting him.

I guess we just know better for next time, and can be on the look out and be more prepared. My room seems so vacant without the tank there anymore.
 

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