Crayfish should be cared for exactly as you would tropical fish, however, you do not need an aquarium heater. In fact, cooler water is preferable for their survival. They prefer their tank to have fish in it, so they can apprehend and eat them.
This is included on the one hand to make your more successful with the crayfish, but also to warn you that with crayfish in the tank, you shan't be successful with the fish. Crayfish prefer to eat fish meat, canned shrimp, frozen blood worms, any kid of convenient and relatively "clean" meat. An example of an inappropriate food source would be fatty roast beef, even though it's meat.
We kept ours alive for their natural adult lifespan with little more than Sanfransico Bay brands' "Prime Reef" served in chunks. The ideal crayfish tank would have an inch of gravel on the bottom, some plastic and live plants such as Aponegeton bulbs, a daylength of 16 hours, using full spectrum lighting. The best bulb for full spectrum lighting is the CoraLife ... more.
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