My plants don't looks good. How can I improve it?

[Ivan]

Hello

I have live plants on my tank (20 gallons long), they don't look good. I don't know what to do.
I'm using root tabs, Easy Green All-in One, Easy Iron, Easy Carbon but my plants don't improve.
If I increase the light intensity I get a lot of hair algae.
I don't know what to do.
As you can see on the photo with the rock, the crypts lost all leaves.
On the other photo you can see the leave are not nice, they have brown spots and there is not new leaves, I have this plant for more than 6 months. already.
 

[Fish Folk]

Watch this video very carefully.

Consult this graphic.

Read this article.

https://www.aquariumcoop.com/blogs/aquarium/plant-nutrient-deficiencies

[Jennifer V]

Have you recently added more root tabs under the crypts? I accidentally killed one of mine by placing too many root tabs directly under it. 

[Ivan]

On 9/9/2021 at 11:52 PM, Jennifer V said:

Have you recently added more root tabs under the crypts? I accidentally killed one of mine by placing too many root tabs directly under it. 

I add root tabs once a month. I put then next to the crypts.

[Ivan]

On 9/9/2021 at 9:56 PM, Fish Folk said:

Watch this video very carefully.

Consult this graphic.

Read this article.

https://www.aquariumcoop.com/blogs/aquarium/plant-nutrient-deficiencies

Thank you very much, I'll watch and read all this.