Reduce the lighting time by 30% and use discarded long sticks to roll up the overgrown filamentous algae. Throw it away, increase the amount and frequency of water changes, and add algaecide.

Shorten the lighting time. If it is on the tank wall, you need to use an algae scraper to clean the brown algae on the tank wall, and change the water frequently. In the first week, it is recommended to add live nitrifying bacteria every day to quickly pass the brown algae period. In the second week, green moss will begin to appear. Increase the amount and frequency of water changes and add algaecides.

Reduce the lighting time, strengthen filtration and water changes, use ultraviolet germicidal lamps to kill the spores that cause green water, but be careful not to leak ultraviolet rays and cause harm to people, increase the amount and frequency of water changes, and add algaecide.

Trim off the leaves that are already covered with black algae, and use a syringe to spray the algaecide. During this process, you need to turn off the filter and slowly and specifically spray the surface of the black algae, or brush it on the surface with a toothbrush. Try to let the algaecide stay on the surface for 15-25 minutes, and observe the state of the fish and shrimp. If the fish and shrimp are restless, change 1/3 or half of the water.