The tea in the fish tank shows that there are brown algae. Brown algae is a common algae, which is usually easy to see in the early stage of fish farming. It is different from green algae, which are highly dependent on light. Brown algae have low demand for light, and mainly absorb ammonia nitrogen in water as nutrients. With the establishment of nitrification system, the ammonia nitrogen content decreases, and then it can be gradually disappeared by providing proper light.

1. Manual cleaning: The method of manually cleaning algae can be said to be immediate. Prepare an algae scraper and scrape off algae from the tank wall. Before scraping, it is best to put the fish in other places for temporary breeding, so as not to scare them, and then put the fish back after cleaning them up. In addition, pay attention to illumination and feeding to avoid algae growing again.

2. Fish cleaning: If you don't want to clean it manually, you can also raise some algae-eating fish, such as black-line flying fox, elf fish, golden moss rat, etc. They all feed on algae and can eat algae by themselves in a fish tank. It should be noted that in order to let fish eat algae, it is best not to feed too much, otherwise they will not eat algae if they are used to fish food.

3. Medication cleaning: Algae removers are basically chemical agents, which have certain risks when used. They pay special attention to the dosage, but the effect is also very good, and they can be used less in normal times, thus playing the role of preventing algae growth.