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I have an Oto who in the last hour has started floating at the top of that tank, occassionally swimming erratically with no contol. He is very bloated.

I had thought swim bladder problem but when I tried to research it someone said they dont have a swim bladder?
What is wrong and how do I help him?

Nitrates 5
Nitrites 0
Ammonia 0

Last water change 25%, 12 hours ago.
Cyanobacteria problem in tank.
Also betta been unwell for a week, nearly finished treating with anti internal bacteria medication but not noticing a lot of differennce in the betta. He has different symptoms.

Edit: I added Seachem Flourish for the first time today in my water change. No other changes.

Oto died within minutes of finding him. Any help still appreciated so I know for the future. Is this contagious?
 
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