i have a fish pond full of koi and goldfish, all the black goldfish are dieing and i don't know why?

Question

i have had 11 fish deaths in the past month, it began shortly adding a new fish - the others stopped eating then one seemed to die each day then we replaced the filtration system, pump, treated with salt, ich tx and deaths stopped for about 1 wk then started again 3 days ago with 1 death each day and i don't know why. the ph is perfect, ammonia and nitrates only mildly elevated ; of the fish 9 black and 3 golden goldfish died - the other kinds seem ok. are goldfish less hardy?

Answer 1

Some types of goldfish are less hardy than others and Black moors are among the more delicate. Without a few more details on what the fish may look like or act like in the day / days before they die it's almost impossible to say for certain what's going on, but my first two choices for the source of the problem would be the elevated ammonia levels or a bacterial disease in the pond.

MM

Answer 2

clean it there might be bacteria




yayaya