Dead fish


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I am an avid koi keeper who has had a pond for 20 + years last winter I lost all my scale babies (crying as I write this)except for 6 goldfish and 3 koi I was Devastated it was a lake ,absolutely gorgeous after the loss my husband tore it down and built a koi pool I like it because I can again interact with the fish again like when I was younger pet them and train them anyway it’s about 6 foot deep roughly 6000 gallons with a massive filtration and plumbing system with returns and drain suv is 55 watt plus I’ve in filter extra pumps I dont know all the specs but I can find out if needeso 2 fish jumped out of holding while hubby was building and got banged up but lived you could see some flesh on 1 that jumped out then after letting new pool acclimate 3 weeks we bought $700 worth of new scale babies all have developed something with a white haze over eyes and tails and fins hard and rottingi I have given them parasalt baths have maybe 4-6babies left help!! I know it’s a infection but what parasite …bacteria…. I almost lost all my new babies do you think a disease that maybe killed all my other fish carried over to my new pool all my readings are perfect I’m so upset and doing water changes I have reverted to chemicals since illness for I only used one fix biological and mosquito repellant from microbe lift and our water is very very hard so I always always use a dechlorinator when adding new water I’m tired of crying today oh was high never had that and kh and gh low 1st pic old pond then new then pics of babies last one fish straight up n down with lesions
 

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That's a lovely pond.

What are your water parameters? Fin rot can be bacterial, or an issue with poor water quality, so tests for ammonia, nitrite, nitrate and KH would be helpful. Please use liquid tests, not strips as those are inaccurate.

You said your KH is low but your water is hard? That seems contradictory. What are the actual numbers for KH?

Three weeks would not be long enough to cycle the pond. Did you have any fish in there for that 3 weeks? Is your filtration equipment new or did you transfer it from the lake? If so, how long was is off before getting it running again?
 
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Jhn

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Agree, with @WaterGardener, it sounds like the new pond you built wasn’t cycled properly, then you added what sounds like a fair amount of new fish. With no biological filter, the ammonia is going to spike. On top of that you said your ph is high, ammonia becomes more toxic at higher ph. What you are seeing on the newbies are the effects of being stressed due to poor water quality. I would do water changes and add dechlorinator, and prime or some type of ammolock to detoxify the ammonia, as well. Really all you can do is try to keep the ammonia under control until the pond cycles, wouldn’t try to chase numbers on your ph, as rapid swings are more harmful, than staying steady.
 
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