Today we are going to prepare the water for our Opae`ula habitat. First, we put in infected gravel for the bacteria. Then we got to pick a rock.The rock we picked have algae, bacteria, producers, and Decomposers. We also used a Hydrometer to measure the water and how much salt Mr. David put. The water we are making is going to be a specific gravity of 1.006 to 1.008. The Opae`ula came in the water with a specific gravity of 1.004. Sea water has a specific gravity of 1.024 and the fresh water has a specific gravity of 1.000.
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