Freshwater Aquarium Content Enhancement

Modify the tank content to a clean and minimalist freshwater setup. Use a base of fine white sand and a few smooth river stones. Include clusters of bright green Vallisneria waving in a gentle current. The scene should look incredibly healthy with high-contrast colors and no visible algae. Add a single, majestic Halfmoon Betta fish with flowing, iridescent fins as the focal point. The overall atmosphere should be serene, bright, and meticulously maintained.