Oxygen

[Christina365!]

Hey folks. How does one check for too much oxygen in the tank? I asked the pet store and they seemed baffled ... I have an 8ft 270g tank, two small pieces of driftwood in there with java ferns and a 42” bubble wand.
My Silver arowana that died displayed so many illnesses in his final hour and so I don’t know what killed him in the end (yes the water parameters were good). He was happy and playing in my bubble wand. Next day he changed his behaviour. I did notice that he convulsed ALOT with his head a few times. Got on camera. And then on his death bed he laid on the bottom of my tank burping every few seconds... but he didn’t have bubbles on his body which would indicate too much oxygen.
My lights in the tank are dim because I know they get down eye on captivity. I don’t know if that meant the few plants I have in there absorbed the oxygen??‍
Just trying to figure this one out

 

[tlindsey]

https://www.monsterfishkeepers.com/forums/threads/measuring-dissolved-o2-in-the-water.649371/

Hey folks. How does one check for too much oxygen in the tank? I asked the pet store and they seemed baffled ... I have an 8ft 270g tank, two small pieces of driftwood in there with java ferns and a 42” bubble wand.
My Silver arowana that died displayed so many illnesses in his final hour and so I don’t know what killed him in the end (yes the water parameters were good). He was happy and playing in my bubble wand. Next day he changed his behaviour. I did notice that he convulsed ALOT with his head a few times. Got on camera. And then on his death bed he laid on the bottom of my tank burping every few seconds... but he didn’t have bubbles on his body which would indicate too much oxygen.
My lights in the tank are dim because I know they get down eye on captivity. I don’t know if that meant the few plants I have in there absorbed the oxygen??‍
Just trying to figure this one out

 

[squint]

It's impossible to get more than a little over 100% oxygen saturation with an air stone.

I've gone over 300% with an oxygen concentrator. Fish were fine...very bold and energetic.

 

[Oughtsix]

How long has the tank been established?

How long had the arowana been in the tank? Was he in the tank by himself? Any recent new tank mates? Any other recent changes in the tank? A recent water change?

Is there any chance something foreign could have fallen into the tank? Did you change any water when he started acting funny? When did you run the water tests? PH?

Ammonia, nitrites, Nitrates and oxygen levels are all common problems to look at first but there are many other possible causes... chemical poisening, bacterial infection, fungal infection, parasite, something wrong in his food, etc.

 

[squint]

He may not have been playing in the bubbles but trying to get more oxygen. Sick fish sometimes do that.

He may have been sick for several days.

 

[duanes]

Dissolved oxygen saturation in water is almost entirely temperature dependent.
Water at 50"F will hold more oxygen than water at 75'F.
Trout that normally live in cold water require @ 10ppm dissolved O, tropical fish are good at 7pp.
So I (like the others) doubt your arowana died from the O, most warm water tanks struggle to retain enough O with normal aeration equipment, with how they are stocked, and the amount of metabolism going on in them.
I use venturi valve to help add more.

and it has never become super saturated enough to do damage.