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Hello. I know of a good website for all things relating to blue crayfish: bluecrayfish.com
I found this under the FAQ, What pH and water temperature do they require?
"A pH of 7.0 (neutral) with a temperature between 70 and 75 degrees Fahrenheit. A heated aquarium is not recommended for crayfish."
We used to just catch them in the creek. I do see them for sale now in the lfs sometimes. I had them in their own tank as I found they didn't play nicely with other fish.