Today, we learned how to take care of our Opae`ula habitat. We only feed them spirulina. How much? Stick the tip of the toothpick in the spirulina and tap the toothpick on the glass and that will be enough. First, we learned the stages of the opae`ula. The first stage is the egg, the second is larva, third is juvenile, the fourth is molted shell, and the fifth is adult. Next, we learned how to feed the shrimp. Then, we learned how to clean the tank. Finally, we learned what to do and what not to do.