On auspicious days, put something, not fish.

When auspicious day comes, put some lotus flowers and blessings instead of fish.

Lotus: Lotus symbolizes nobility, purity, auspiciousness and happiness in China culture, so it will be used instead of fish in some occasions.

2. Fuzi: Fuzi is one of the most common mascots in China traditional culture, representing happiness, auspiciousness and good luck. On some occasions, the word "Fu" can be used instead of fish.