I have 21 fish some in the pond and some in the tank.
I lost one in the pond a few months ago then a few weeks ago one of my goldfish in the tank died and now a few days ago another one of my fish a danio called Buddy died. Dasher I know was a bit wobbly I treated her as it looked like swim bladder but she sadly died but now Buddy the danio has died just a few weeks later showing no symptoms. Is there anything I could do. I have a good filter too and plants real plants.

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Diesel curtesy of Tashi.

My babies.

6 tank fish. Dylan, Monty, Shadow, Ghost, Phantom, Sidney aka Sid for short

23 pond fish. Zoomie, Cash, Tod, Murphy, Bingo, Kovu, Rufus, Wilbur, Miles, Mitzy, Ralph, Stan, Archie, Marley, Megan, Tommy, Ike, Twix, Rio, Keesha, Oz, George, Bruce.

Have you recently transferred any fish between the tank and pond? It's highly unlikely that the deaths in the pond and tank are linked, however if fish were transferred, then pathogens could quite easily have been transferred between different environments.

Do you have a liquid test kit? If so, could you provide the test results for pH, ammonia, nitrite and nitrate?

Are any of the fish showing any unusual symptoms (i.e flicking, rubbing, rapid or laboured breathing, listlessness, sores, spots)?

None of the fish wree transferred between the tank and the pond although hold on I moved house and brought the fish I already had Dasher and Comet and Dylan to the new house. No flicking rapid laboured breathing rubbing or listlessness sores or spots apart from one just looked at him Monty is leaning slightly. Checked ammonia and ph will double check the ph ammonia and nitrates when mum gets home as need help with it due to visual impairment.

__________________
:
Diesel curtesy of Tashi.

My babies.

6 tank fish. Dylan, Monty, Shadow, Ghost, Phantom, Sidney aka Sid for short

23 pond fish. Zoomie, Cash, Tod, Murphy, Bingo, Kovu, Rufus, Wilbur, Miles, Mitzy, Ralph, Stan, Archie, Marley, Megan, Tommy, Ike, Twix, Rio, Keesha, Oz, George, Bruce.