i figured i should add the shrimp since nothing is really live in the tank. the sand is argonite and the rock used to be live but it had been awhile since it got wet. i soaked it in hot freshwater a week or two ago and let it dry out in the sun until the past couple of days when i set up the tank. i figured there would be minimal die off so i should add the shrimp. just wasn't sure if i could add the shrimp to the tank before everything settled down which it is doing nicely.