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My widow tetra fishes are dying one by one.They seem to float around with lack of control and seems gasping for air.I have quarantined this fish and added some common salt to help it breathe.
It is now floating in the surface and opening and closing its mouth repeatedly.
Is this some kind of infection that spreads.Please advise

View attachment 32186
Not knowing much about your chemistry, my first thoughts are low oxygen, untreated tap water, or acidic ph.
 
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