After a while I decided to put my betta in it (this was a bad idea). the plants got bigger and greener.
I added the mopani wood and put the moss on it (with the two anubias plants). the water is a bit darker now (because of the wood). It’s more natural. I like it.
And here are my two tanks (left: the betta tank that doesn’t look good and right: shrimp tank)