1. Common Goldfish (Carassius auratus): Common goldfish is one of the tropical fish suitable for aquariums. They come in domesticated varieties such as red and white, orange, black, etc. They are quite hardy and are suitable for average water conditions, but it's important to avoid overfeeding and excessive breeding.

2. Gourami: Gouramis are a common type of tropical fish, known for their beautiful colors and gentle temperament. Varieties such as the Dwarf Gourami and Pearl Gourami are popular choices.

3. Community Carnivores: Some small carnivorous fish, such as Black Phantom Tetras and Hatchetfish, are suitable for cohabiting with other peaceful community fish. Their diverse diets help control leftover food at the bottom of the tank.

4. Betta Fish (Betta splendens): Betta fish, especially the single-tail variety, are small tropical fish known for their vibrant colors and distinctive fins. It's essential to avoid placing them together in the same aquarium to prevent aggression.

5. South American Dwarf Fish: This category includes fish like Neon Tetras and Angelfish. They often display bright colors and active behavior.

6. Dwarf Gourami (Trichogaster spp.): Dwarf gouramis are smaller tropical fish with vibrant colors and unique personalities. They are suitable for cohabiting with other small social fish.

7. Angelfish (Pterophyllum spp.): Angelfish have an elegant appearance with various colors and forms. Although they are larger, they are typically peaceful fish suitable for larger aquariums.

These fish are suitable for aquariums, but it's essential to understand their care requirements, including proper water quality, feeding practices, and fish social behavior. Depending on the size of your aquarium, water conditions, and your experience level, choosing the right fish will help create a beautiful underwater landscape.