I have 2 aquariums in one is my 6 year old oscar. The other had a die off years ago of all the fish but one blue gurami. I treated the tank for everything but any other fish i added died. Now hes been alone for years. I tried adding 2 mollies 2 catfish and a betta. The betta is fine but all the other fish passed away. Is there an illness that dosnt affect surface breathers?
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