Lay 1-2cm of water and grass mud on the fish tank in advance, and then add some water into the tank. The water volume is not too much, and the soil can be soaked. Then evenly sprinkle the seeds on the water and grass mud. Pay attention not to cover the seeds with water and grass mud. Cover the fish tank with a plastic film after the seeds are sprinkled. Then poke a few holes in the plastic film to keep the temperature stable. Keep the temperature at 25-30 ℃, keep the sun full, and germinate after about 3 days. Sprinkle water every day to keep the water and grass mud moist, and keep the water and grass mud moist. Hold the light, about 5 days water grass will basically grow out.
When the water and grass grow up, you can slowly fill the fish tank with water. When adding water, you should slowly add water along the tank wall to avoid flushing over the soil bed.
