Anyway to keep crawfish alive in tank for a week+?

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I just don't want to kill 20 pounds of crawfish.

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Crayfish require an aquatic habitat. You should have holding tanks and habitats prepared before receiving your shipment. Use conditioned tap water, spring water, or well water. The water should cover the back of the animal, and needs to be no more than 15 cm (6") deep. If kept in deep water, crayfish can deplete the oxygen near the bottom. Since they cannot easily swim to the surface for air, they may suffocate.

If you want to keep them in deep water, an air stone, filter, or power head (pump) will circulate the water and keep it oxygenated; however, crayfish will climb an airline or power cord and escape unless the tank has a cover. Crayfish may be kept in aquaria, buckets, or other glass or plastic containers. The number that can be kept depends primarily on the size of the crayfish and the length of time you wish to keep them.

For short-term storage, 12 to 18 crayfish can be held in a 20-gallon (12 × 24" bottom area) aquarium or a container of similar size. For long-term maintenance, up to 2 medium or large crayfish can be kept per square foot if you provide hiding places.

Rocks can be used for this, or lengths of plastic pipe. The size depends on the size of the crayfish. Cut the pieces lengthwise, making 2 hiding places per length of pipe. Provide more hiding places than the number of crayfish. Observe the crayfish for a few days. If you see signs of aggression, you may have to move some crayfish to additional habitats to reduce conflicts.

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and a finer mesh they can’t get through?

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