I have two koi ponds that are approximately 500 gallons each. They were conjoined at one point but a leak caused me to split up the two liners putting half the fish into two separate halves. I have since then resealed the two liners after a few months and am getting ready to combine the two again. My main concern is the different bacteria in each pond killing the fish when the two ponds are joined. I was advised at petco to swap the filter media of both ponds with each other to acclimate the koi to the other bacteria. I’m not sure if this method would work and would want to know the safest way to combine the two ponds without harming the fish.
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