Today, we put in some bacteria, added a rock, and put in the salt water. First, we put in some bacteria for the shrimp. We used gravel in brackish water. After that, we chose a rock that had a little algae on it. We needed algae on it so the shrimp can eat it. Lastly, we added salt water. We made the salt water with salt and we made sure it was not to much water or to much salt so we used a hydrometer. We made sure that it was at 0.06. Finally, we poured the water filling half of our glass. We let it out in the sun after that.