The usage of the floating box is to insert the floating feet into the sponge gap below and press the floating seedlings into the sponge gap in the middle of the floating box. The sub-box is made by knotting the sub-rope, folding the sub-rope in half and adjusting the hook distance, then hanging the buckle on the protrusion on the sub-box, then tightening the sub-rope and hanging the hook on the sponge of the sub-box.