Why are they doing this?

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This is the first time i saw them do this. They are under a waterfall.
I just saw this post. 2 thing are quite important when it comes to testing. They would be the kH & nitrite more so than the nitrate. Ammonia does look like it could be .50, not zero if the color in the pic is correct.

Re: the fish swimming in the falls ... My koi are 14"- 26" ... a few of them do this all the time. They swimming right directly toward the falls in front of it but never reaching it. I believe it's the current. I'd get the ammonia down and figure out why it's up but it's not ammonia doing that. I'd say if they're not gasping at the top, they're just having fun.

Agreed, that too much of a fish load for 650 gallons. Again, maybe I missed it but I don't know what the filtration you have is. I'm filtering for approximately 6000 gallons and only have 2000. With all do respect @Stephen Noble but no heat ... lol ... just thing 4 goldfish @ 5" isn't much. Again, must have missed his filtration parameters but years back in a 650 gallon pond, I had 9 koi. It was good for years and then I upped the filtration system. I currently have 10 koi in 2000 gallons, but again, I've got triple overkill on my filtration.
 
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A good rule of thumb is (1) gal./inch of fish.
That would give him 650 inches. No can do ... Wrong thumb! lol ... I think you left out a zero ... 10" to 100 gallons ... correct me if I'm wrong.

I have about 200 in 2000 gallons but again, filtration plays a big part.
 
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That would give him 650 inches. No can do ... Wrong thumb! lol ... I think you left out a zero ... 10" to 100 gallons ... correct me if I'm wrong.

I have about 200 in 2000 gallons but again, filtration plays a big part.
That would give him 650 inches. No can do ... Wrong thumb! lol ... I think you left out a zero ... 10" to 100 gallons ... correct me if I'm wrong.

I have about 200 in 2000 gallons but again, filtration plays a big part.
Thank you 10 gal.
 
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The pond has 3 filters with a total 9000 gal of filtration. All 3 discharge into 3 waterfalls. I also have 3 bubblers and plenty of plants.
 
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The pond has 3 filters with a total 9000 gal of filtration. All 3 discharge into 3 waterfalls. I also have 3 bubblers and plenty of plants.
Wow - Are any pressurized with external pumps? I'm surprised any ammonia shows up. That's 10 times the filtrations you need.
 
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Wow - Are any pressurized with external pumps? I'm surprised any ammonia shows up. That's 10 times the filtrations you need.
Yes two are canister and the other is a filtered waterfall.
 
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Some say there is more maintenance when there is too many fish Ii the pond. Please define what kind of maintenance?
 
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