Combining different fish in an aquarium can be challenging, but if done correctly, it is possible to create a diverse and impressive environment. Here are some important tips and information for combining different types of fish:

1. Understanding the needs of each type of fish
Water Requirements: Each fish needs different water conditions, such as pH, temperature and hardness. It is important to check that the conditions are suitable for all the fish you plan to combine.

Nutrition: Make sure all types can get along with the same type of food or with different food that won't cause a lot of competition.

2. Behavioral traits
Social fish: Fish like guapi and neon tetra are social fish that can live together with other fish in a calm manner.

Territorial fish: Fish such as cichlids may be more territorial and sometimes aggressive, so be careful about adding them to an aquarium with other fish.

3. The size of the aquarium
Aquarium dimensions: It is important to make sure that the aquarium is large enough to accommodate all the fish comfortably. The bigger the aquarium, the more room the fish have to move and avoid competition.

Hiding: Adding hiding places such as plants, rocks and caves can help fish feel safe and reduce stress.

4. The amount of fish
The Golden Rule: A good rule of thumb is not to add new fish to the aquarium faster than 1 inch of fish per 1 gallon of water. This helps to avoid overloading the system.

5. The process of introducing new fish
Gradual introduction: if you add new fish, it is recommended to introduce them to the aquarium gradually, and not all at once. This allows the existing fish to get used to the new fish and reduce competition.
Observation: After introducing new fish, it is important to monitor their behavior, and make sure there is no aggression or health problems.

Summary
Combining different types of fish in an aquarium requires planning and prior knowledge. It is important to know the needs of each type of fish, understand their behavior and make sure that the conditions in the aquarium are suitable for all of them. With a little patience and attention, you can create a rich and varied living environment for your fish.