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why did my koi die?
We have a 120 gallon outdoor pond which had 3 5" koi and a 6" catfish
in it for the past 2 years. The pond had an auto-refill system straight from tap water which was recently inadvertently turned off. After finding this, I turned the autorefill back on slowly. I figured maybe 25 gallons at most had evaporated before we noticed the problem. To make a long story short, all the fish died within 24 hrs, and I figured it was from too much chlorine shock. I took this opportunity to totally clean the pond, and cleaned out a 1" layer of sludge on the bottom of the pond, and I also decided to get rid of about 70 lbs of small river rock on the bottom. I refilled the pond with tap water, and ran the pond for a week with pumps going. I readded 2 koi, and a goldfish which all died within 2 hours. I must have done something very wrong for them to die so fast. What killed these fish? Should I wait longer than 1 week prior to adding fish? I do have about 60 lbs of large rocks in the pond, should I also add back some small rocks to help reestablish biological filtration? |
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