Preparing the gravel is one of the many important things for the opae`ula to enjoy in their new habitat. But there was a helper and his name is Mr.David. This how you prepare the gravel so your opae`ula can enjoy it. First, take 5 plastic spoon scoops of gravel and poor it in a bucket. Next, pour water in it and mix it around then empty the water out and do that until the water is clear. Third, you take 5 scoops of the gravel again and put it in the shrimp tank. And that's how you prepare the gravel.Thank you for reading!