Recreation:

1- make a 3 by 3 grid where you can plant kelp

2- put a water source in the center

3- put a kelp in the water source

4- fill the three blocks on the top right corner and the bottom left corner

5- put a water source on the top right corner

6- break the blocks on the sides of the second layer

7- place kelp on top of the first one on the flowing water in the center of the second layer