Step 1: Gather Moss
Spanish Moss is abundant here in Florida. I recently read that Spanish Moss makes good grass beds for spawning. I removed the moss from a tree using a fruit picker.
Step 2: Weaving the Moss
I wove one end of a bunch of Spanish Moss into the sides of mini crates.
Step 3: Sinking the Basket
After completing the weaving all around the crate, I placed a heavy broken piece of concrete in the basket and placed it in the koi pool. It readily sank to the bottom and the moss floated toward the top.
Step 4: Finished!
Let the spawning begin!