To get rid of algae in your fish tank naturally, you can try the following methods:

1. Change the water regularly.
2. Check the water levels and use special treatments.
3. Clean your plants with bleach.
4. Wipe your decorations with vinegar.

Be careful with bleach because it can harm good bacteria and kill fish.

Another way to get rid of algae in the fish tank naturally is to maintain a well-balanced ecosystem inside your tank by controlling lighting and nutrients.