But it looks so Amazony, if that's even a word :lol:
Not all parts of the Amazon River are dirty and muddy; there are areas that are tannin-stained but the water is also very clear.
The light in your tank doen't look execptionally bright, but yes it could be a little dimmer, but I think it looks cool how it is.
Most of the plants in your tank are ones that come from the Amazon; your fish are Amazonian, you have some lovely sand for the substrate, and the dead leaves in the tank are giving the water tannins.
So I still think it is a biotope :lol: