Help Low Oxygen Dying Tetras

[lukeshaw]

Hi all

After 1 year all my black fin tetra died and 3 female bettas, the plec has come out from hiding and is hanging near the top.

I have taken a sample to my local fish shop the were happy, I have done 2 water changes, adding medicine & salt tonic.

Ive taken the lid off to help air, I have the filter poking out of the water creating water good Aggitation/circulation I also have an air stone and just added a water pump. Ive done 3 o2 test with a kit and all showing low oxygen levels. I cannot do anymore to creat oxygen????

Its a 110 litre tank

Any ideas?

Thanks

Luke
Reading
Uk

 

[Aiken Drum]

Can you hold the test result over the colours on the sample card rather than against the white background. The whiteness of the background is making the test look lighter than it is and makes it difficult to see what the result is.

Can you run some tapwater into a jug, then test the water from the jug and compare that test result to the one from your aquarium.

Where in the aquarium are you taking your sample? A sample from the surface near to where the agitation is taking place should be showing more O2 than a sample taken from a dead spot at the bottom. Are you seeing this difference?

Despite the test, you are creating plenty of surface agitation, and I'd be more inclined to say the test is inaccurate and your issue isn't O2 related. What are your other water parameters?

Edit. Have you tried using the Tetra app to read the test result? Maybe the app can make a better judgement on the test result than your eyes?

 

[Andy Sager]

Hi all

After 1 year all my black fin tetra died and 3 female bettas, the plec has come out from hiding and is hanging near the top.

I have taken a sample to my local fish shop the were happy, I have done 2 water changes, adding medicine & salt tonic.

Ive taken the lid off to help air, I have the filter poking out of the water creating water good Aggitation/circulation I also have an air stone and just added a water pump. Ive done 3 o2 test with a kit and all showing low oxygen levels. I cannot do anymore to creat oxygen????

Its a 110 litre tank

Any ideas?

Thanks

Luke
Reading
Uk

If the Bettas died and you suspect it's from lack of oxygen, there's a problem with the theory because Bettas are Labrynth fish and can take oxygen from the atmosphere so they don't need oxygenated water to survive. It sounds more like there was a pathogen that attacked the gills of the fish or possibly a pollutant got into the water causing the fish to have breathing problems. You need to do a full panel of tests, not just O2, to make sure other levels are not the cause. Also did you add anything new in the way of plants or decorations just prior to the fish dying?
I'd take your Pleco and place it in a tank or any clean container with new clean water and see if that gets the fish off the surface. If that works, I'd do a 100% water change in the tank ( with no other fish in the tank) and see if that solves the problem.
If that doesn't work, you may need to consider breaking down the tank and starting fresh if there were no new additions and your water chemistry checks out okay.