EMERGENCY Koi dying at fast rate

Koi are very hardy fish and they actually can deal with an ammonia spike quite well, IF they have the water capacity.

Koi also grow very quickly, on a varied diet mine grew 1"+ per month.

I don't think 10 gallons is not going to cut it; donate them or they will also parish in that small tank.
 
I kept Koi inside over the winter for 5 months, before putting in a 100 gallon pond this spring. I had a 20 gallon cycled tank however. I think what happened to your Koi is a result of the tank not being cycled. I would recommend pulling a piece of filter material out of your pond and adding it to your indoor tank. If nothing else grab a few rocks or something from it and put them in the tank ASAP.

Where did you happen to get them from? I always buy my domestic Koi from Petsmart and I have had good luck with all but 1 out of 6 so far. The first 3 I bought were fine, but one of them just simply died... the other 2 are now about 10 inches long, and I just put 3 more small Koi in the pond with them.

I know they aren't the highest quality fish but they grow fast and my bigger Koi look great! Hopefully it's not too late for your ghost.
 
You really really can't keep a koi in a 10 gallon, I am a salty guy (lol), but even I know this. I would say too small tank and ammonia poisoning.
 
I think the general rule for koi is 300 gallons for one and 100 gallons more for each after.
 
You cannot keep juvenile fish that are supposed to be HUGE (Koi grow to 3' long) in a 10G tank for anything more than a quarantine period or you risk stunting their growth during their most formative years. A Koi should grow 50% of it's length in the first two years so that is the time it should be in a big pond so it has ample growing and development room.
 
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