We had a major issue with a cracked filter and all the water completely drained out except about 3 or 4 in. I was able to put my 6 koi about 6 to 8 in long in a temporary tub with 20 gallons of old pond water and a pump to cycle water for oxygen. Question is how long will they last in tub? I am preparing a 150 gallon stock tank to keep them in until main tank is ready just added water and chemicals so it may be a few days before I can add fish to it. Just not sure if koi will be ok for few days until 150 is ready