Why my Oscar is not eating?

[Keepers]

Does it look better now？
But they are some white things on his fins

 

[Keepers]

Can I change it to other tank? Because he always fighting with other fish

 

[SalviniCichlidFan]

If your pH is in the 4.0-5.0 range you should seriously consider getting a buffer/solution that raises your pH. Even though Oscars are a South American species, I doubt they will thrive in that low of a pH.

 

[Keepers]

If your pH is in the 4.0-5.0 range you should seriously consider getting a buffer/solution that raises your pH. Even though Oscars are a South American species, I doubt they will thrive in that low of a pH.

OK， thanks

 

[Keepers]

If your pH is in the 4.0-5.0 range you should seriously consider getting a buffer/solution that raises your pH. Even though Oscars are a South American species, I doubt they will thrive in that low of a pH.

But he always fighting

 

[Fishman Dave]

If you have another empty tank then when you do a water change, use that water to fill or part fill that tank. Move across one of the filters too if you have more than one. If not you need another filter and can move just some (half) of the filter medium from your existing filter into the new one. Then refill the old tank with new water and add around the same volume of water you already added to the new tank too. This way both tanks are now set up with the same water and a working filter. The Oscar can be moved into the new tank.
Note however that you are not giving me a warm fuzzy feeling that you are testing the water and doing good for the fish. Not knowing the water results for a tank you have obviously had running a while and then Mentioning he is always fighting 17 posts in to a thread asking why he is not eating is not good- this is no doubt why he is not eating , because he is being bullied.

 

[Keepers]

If you have another empty tank then when you do a water change, use that water to fill or part fill that tank. Move across one of the filters too if you have more than one. If not you need another filter and can move just some (half) of the filter medium from your existing filter into the new one. Then refill the old tank with new water and add around the same volume of water you already added to the new tank too. This way both tanks are now set up with the same water and a working filter. The Oscar can be moved into the new tank.
Note however that you are not giving me a warm fuzzy feeling that you are testing the water and doing good for the fish. Not knowing the water results for a tank you have obviously had running a while and then Mentioning he is always fighting 17 posts in to a thread asking why he is not eating is not good- this is no doubt why he is not eating , because he is being bullied.

I do, I have another empty tank. I found some scales from him, so I think my golden dorado fight with him

 

[tlindsey]

Yeah you have to get the Oscar out or Golden Dorado will eventually kill it.

 

[Keepers]

Yeah you have to get the Oscar out or Golden Dorado will eventually kill it.

I will put it in my another tank

 

[Keepers]

Can I put it in my other tank right now? But many gold fish in there