If you want to disinfect the old fish tank, you need to wipe the whole fish tank first. If there is scale, you need to wipe it off with a little acetic acid. If there are algae attached to the tank wall, you need to scrape it off with an algae scraper. Wait until the fish tank is clean, then soak it with potassium permanganate for a period of time, usually for 3-4 hours, then drain the water and rinse it with clear water several times.

1. Decoration: If the old fish tank does not raise fish, it can also be used as an ornament, provided that the fish tank is not very large. Although larger fish tanks can also be used as decorations, they need too much materials and are troublesome to manage. You can plant some flowers and plants in the fish tank, but make sure you can see the light.

2. Give away: If you feel that the old fish tank is empty at home, you can also give it away to your friends if they are willing to raise fish. Of course, fish tanks also have a certain service life. Even if they are cleaned again, as long as the time is long enough, there will inevitably be the risk of water leakage. Don't send such tanks.

3. Sell: If you feel that giving away is too bad, you can also sell the fish tank. However, the general fish tank is glass, so it is best to find a city to buy, buy it and transport it directly. If you want to mail it, the risk is still relatively large.