Fish Dying One by One

[Poseidon2.0]

What kind of filtration do you have on the tank?

Have you changed the water other than the one you mentioned from four days ago? If so, how much? Water changed at the rate of 75% every couple of days will help.

Are you using a liquid test kit to determine your water parameters or the paper strips? Paper strips are inaccurate.

What are the size of your fish? The one looks large. You have likely maxed out your system by introducing the new fish.

 

[twentyleagues]

Yup. I have an idea. You added 3 +1 large aggressive fish to a tank that had been running fine for years with 2 fish in it. You caused an ammonia spike the established bacteria couldnt handle. Bacteria population exploded and went into the water causing a lack of oxygen. Was the only Fish that died the on that died from injuries? You are not really being accurate or up front with your information either. You came for help we need the info on your tank to try to provide help. In your first post you indicated it happened out of the blue. In your second post you told us that you added a couple fish and that one had viciously attacked the other causing life ending injuries. And in the third post we find that you not only added a couple fish but there were actually 4 fish added. Anything else youd like to add so we can actually help? Id suggest the following
Wc schedule when how much?
Tests when, readings, test equipment?
Feeding?
Watertemp?
Size and correct amount of fish
Were the fish qt'd?
Any type of meds?
Filtration?
You want help most of us would like to help lets make that happen!

 

[Poseidon2.0]

It also seems you don't listen to advice. Just three months ago you lost 4 other fish and were having trouble with your oscar's eye issues according to your post from three months ago:
https://www.monsterfishkeepers.com/forums/threads/oscar-with-pop-eye.712960/
Not sure why you keep coming here and not listening to advice.Would definitely recommend you get out of fish if you don't have the time to look after them properly.

 

[AKKADIAN]

Ok, apologies for being vague - I’m just really disheartened. I’ll try and be specific here.

• The Tank: 6ft x 1.5ft
• Filtration: AquaOne 2700 and overhead Wet/Dry - The tank water is being turned over about 11 times per hour.
• Water Change Schedule: Every 1 to 1.5 weeks. About 45%-50% of the water is changed at one time.
• Feeding: Once every two or three days (pellet).
• Testing: API (Liquid). Last tested today with all readings being fine. Test before that was last night with all readings fine.
• Water Temptature: 27.8-29.8 degrees Celsius.
• Current Stock: 5 fish (mid sized Americans) - sizes ranging from 18cm to 25cm.
• Fish Quarentines Prior to Adding: No.
• Meds: No, Seachem Prime added to water as part of waterchange. I added Seachem Strees Guard about half an hour ago (underdosed).

The Scenario:
I have had my tank running for years. It has always usually houses about 7 fish. For whatever reason I removed a few about two or three months ago and was left with only an Oscar (25cm) and a Geo Brazil (18cm).
About two and a half weeks ago I added two fish, both around the 20cm mark. One attacked the other, I separated the attacked fish to prevent further harm (separated within the same tank). The fish started developing fungus on the wounds and a day later it died. It died while I was at work and and hence the dead fish was in the tank for a few hours. This is what sparked the cloudy water. Since then the water has been cloudy, no fish seemed to mind except for last night. When 3 of the 5 fish appeared listless.

I hope I haven’t missed anything.

 

[AKKADIAN]

It also seems you don't listen to advice. Just three months ago you lost 4 other fish and were having trouble with your oscar's eye issues according to your post from three months ago:
https://www.monsterfishkeepers.com/forums/threads/oscar-with-pop-eye.712960/
Not sure why you keep coming here and not listening to advice.Would definitely recommend you get out of fish if you don't have the time to look after them properly.

Mate, you are out of control.
Yes, three months ago I lost three or four fish - totally seperate issue mind you.
In fact, look at the photo I posted in that thread, clear water.
The problem was resolved. The tank was running fine since then...

I’d have to say that what you just posted is the most unhelpful and rude post I’ve read on these forums.

 

[Poseidon2.0]

Mate, you are out of control.
Yes, three months ago I lost three or four fish - totally seperate issue mind you.
In fact, look at the photo I posted in that thread, clear water.
The problem was resolved. The tank was running fine since then...

I’d have to say that what you just posted is the most unhelpful and rude post I’ve read on these forums.

Well, sorry to be rude, wasn't my intention. Was just that you lost four fish a few months ago and then claim in a new thread that everything has been fine for years, giving us the impression that your new fish you just introduced is something new. It isn't. You expressed concern that maybe you should get out of the hobby. I was simply encouraging you to follow that line of thinking seeing as you keep running into health issue with your fish. If you want to keep fish by all means, but seems like you are short on attention for them. Nothing wrong with that, we all have lives and can't always give the hobby the time it deserves. I hope you can work it out. You have a nice sized tank with lots of possibility.

 

[twentyleagues]

Ok so your post states fish dying one by one. Only one died? It was the one that was attacked? (Just for clarification)
If that is the case then the answer to that is it was beaten to death by one of the other fish and died. The added bioload of the new fish plus that of the decaying body caused a bacterial bloom creating a low oxygen count causing fish to be listless. Remedy oxygenate the water increase surface aggitation and add air pumps/ stones to help. Let the bloom work itself out.
Params are fine.....what is fine?
Make sure you shake the crap out of the nitrate test solution #2 or you will get incorrect readings. By shake the crap out of it I mean til it feels like your arm might fall off.
Your choice in fish will most likely cause more deaths. The fh and fh mixes are usually a 1 to a tank at most.
Also without qting we have no idea if there was any type of pathogens add also. So the possibility of a disease or parasite is extremely good atm as well.

 

[AKKADIAN]

Well, sorry to be rude, wasn't my intention. Was just that you lost four fish a few months ago and then claim in a new thread that everything has been fine for years, giving us the impression that your new fish you just introduced is something new. It isn't. You expressed concern that maybe you should get out of the hobby. I was simply encouraging you to follow that line of thinking seeing as you keep running into health issue with your fish. If you want to keep fish by all means, but seems like you are short on attention for them. Nothing wrong with that, we all have lives and can't always give the hobby the time it deserves. I hope you can work it out. You have a nice sized tank with lots of possibility.

The tank for the most part has been fine. I did have that problem a few months back, but the symptoms were totally different.
I enjoy keeping fish and most of the time it’s been good.

With this particular case, I no doubt suspect it has something to do with the introduction of the new fish.
Either adding too many in one go or adding a diseased fish (which I doubt as they were taken from a breeders tank - and that was was in fine condition).
If we go for my first theory, I want someone to explain to me why, if it was due to adding too many fish too soon that the water tests are all fine?

On a side note, so I’ve taken a close look at the water column. It appears that there are millions of small white dots floating in the column. Anyone have any idea what these are? No doubt they are causing the cloudiness.
And, more “sinisterly” there appears to be a few small white worms, about 1mm in length. Gill flukes? I’ve got no idea what these are...

 

[twentyleagues]

The tank for the most part has been fine. I did have that problem a few months back, but the symptoms were totally different.
I enjoy keeping fish and most of the time it’s been good.

With this particular case, I no doubt suspect it has something to do with the introduction of the new fish.
Either adding too many in one go or adding a diseased fish (which I doubt as they were taken from a breeders tank - and that was was in fine condition).
If we go for my first theory, I want someone to explain to me why, if it was due to adding too many fish too soon that the water tests are all fine?

On a side note, so I’ve taken a close look at the water column. It appears that there are millions of small white dots floating in the column. Anyone have any idea what these are? No doubt they are causing the cloudiness.
And, more “sinisterly” there appears to be a few small white worms, about 1mm in length. Gill flukes? I’ve got no idea what these are...

Where are the worms? On glass or substrate id guess planiaria. On the fish its probably parasites.
I also doubt the validity of your tests. But since I am unsure of what fine means I can not tell you for sure. Zeros across the board are not probable. Ultra low nitrate readings on your tank is also probably incorrect. Maybe tests are out of date? Or test proceedures are incorrectly followed?

 

[AKKADIAN]

Where are the worms? On glass or substrate id guess planiaria. On the fish its probably parasites.
I also doubt the validity of your tests. But since I am unsure of what fine means I can not tell you for sure. Zeros across the board are not probable. Ultra low nitrate readings on your tank is also probably incorrect. Maybe tests are out of date? Or test proceedures are incorrectly followed?

I noticed the worms floating in the water column.
Fine means what they are supposed to be as per the instruction manual.

The tests were carried out as per the manual.