Cabomba piauhyensis is an aquatic plant that can be quite tricky to grow in an aquarium, but here are some tips for its maintenance:

1. Lighting: The Cabomba piauhyensis needs intense lighting to grow well. It is recommended to use lighting of 0.5 to 1 watt per liter of water.

2. Substrate: Use a nutrient-rich substrate so the plant can absorb essential nutrients.

3. CO2: The Cabomba piauhyensis needs a supply of CO2 for optimal growth. You can use a CO2 system to enrich the water with CO2.

4. Temperature: The plant prefers a water temperature between 22 and 28 degrees Celsius.

5. Fertilizer: Make sure the aquarium water contains enough essential nutrients for plant growth. You can use liquid fertilizers for aquatic plants.

6. Maintenance: Prune the plant regularly to prevent it from becoming too invasive and to promote denser growth.

7. Placement: Place the plant in an area of the aquarium where it will receive sufficient light and room to grow.

By following these tips, you should be able to successfully grow Cabomba piauhyensis in your aquarium.