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Old 08-11-2018, 01:47 AM   #1
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Location: Melbourne, Australia
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White patches on oscar

My Oscar is in a community tank - they all get along - anyway, it appears to be rotting away. Iíve used fin rot medication but I donít know what else it could be. Any advice would be great.

Today he has developed two small holes in his tail fin.
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Old 08-11-2018, 10:06 AM   #2
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Location: Oklahoma
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It looks like your Oscar might be suffering from Columnaris, a very bad bacterial infection.
It's very difficult to cure. Several have mentioned combinations of antibiotics to treat the disease. Others have suggested salt treatments. I don't remember the exact salt dosage.
Columnaris doesn't exist in salt water.
Fortunately I've had very few fish contract Columnaris over the years. I wasnt able to cure any.
IMO, it's best to remove the infected fish and try to save the tankmates.
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oscar, white

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