A bird cage with dimensions of 46x46x123.5 cm is spacious and suitable for small to medium-sized birds like cockatiels, conures, or budgies. Here are some setup tips:

1. Multiple Perches: Utilize the height by adding several perches at different levels. This encourages climbing and provides variety for your bird.

2. Toys and Enrichment: Incorporate a variety of toys to keep your bird mentally stimulated. Consider foraging toys, swings, and climbing structures.

3. Feeding Stations: Place food and water dishes at different heights. This not only encourages movement but also helps keep the environment interesting.

4. Hiding Places: Provide small shelters or hanging items where your bird can feel secure and have a private space.

5. Safety Checks: Ensure all materials and toys are safe for birds and free from harmful substances.

6. Cleaning Convenience: Choose a cage with a removable tray for easy cleaning and maintain a regular cleaning schedule to ensure a healthy environment.

7. Optimal Placement: Position the cage in a well-ventilated area with indirect sunlight to avoid overheating.