Disinfecting pond , media and maybe fish?

[batang_mcdo]

Have you tested your water?

Yes

If yes, what is your ammonia?

0

If yes, what is your nitrite?

0

If yes, what is your nitrate?

60

If I did not test my water...

1. ...I recognize that I will likely be asked to do a test, and that water tests are critical for solving freshwater health problems.

Do you do water changes?

Yes

What percentage of water do you change?

21-30%

If I do not change my water...

1. ...I recognize that I will likely be recommended to do a water change, and water changes are critical for preventing future freshwater health problems.

I lost all my adult rays 2-3 months ago.
I'be raised these rays for 4-5 years , because of one mistake where i trasted a seller and added a new ray into my pond i lost all my rays. Not sure if it was a virus or bacteria which affected them, but they stopped eating a day or 2 after i added the new ray and dies with in 2 weeks.
I've had zero ammonia, 0 nitrite and ph was at 7.5 . I think the disease only affects rays as i had mollies and guppies and a parrot fish in the pond and they were not affected at all.
Now my pond only has the mollies cuppies and the parrot fish.

How do i get aboit disinfecting my pond aand media? Also can i keep the fish when i want to
Move
Some
Rays into my pond again? Or will these fish be contaminated?

 

[Rocksor]

A large bottle of hydrogen peroxide (at least 32 oz) per 50 gallons will disinfect the pond and media. Your pond will have to be cycled again. Do not use with fish in the pond.

I don't if the mollies/guppies currently carries the ailment brought in by the new ray.

 

[batang_mcdo]

A large bottle of hydrogen peroxide (at least 32 oz) per 50 gallons will disinfect the pond and media. Your pond will have to be cycled again. Do not use with fish in the pond.

I don't if the mollies/guppies currently carries the ailment brought in by the new ray.

Thanks not sure what to do with the existing fish in my pond . Maybe i can try a test ray after i disinfect my
Pond