Temp stability is one reason I did it as well. Even it being 90 degrees outside, my water stayed at 75 the whole time. Try to cool your water down as much as you can without hurting your fish. The water will hold more o2 that way. Also don't use tank water. It will have suspended organic matter in it and make your ammonia go up with no filtration to combat that. You may have known this already but just thought I would throw it out there in case you didn't.
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