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The crabs need a photoperiod like people do, so you need a timer to turn the lights on at dawn, and off at dusk. You reduce the water to zero salinity because the crabs breed in freshwater. Not familiar with the species name of the crabs, but would think between five and six weeks post hatch would be the time to gradually increasing the salinity until you reach brackish water.
Dave
When a finger points to the moon, the imbecile looks at the finger.
Omnia mutantur nihil interit.
The more you read, the more things you will know. The more that you learn, the more places you'll go