ADA Aquasoil Amazonia is attractive for 2 reasons:
1. Black/dark colored substrate to show the color of the fishes better.
2. pH altering properties in favor of acidic range.
The disadvantages have been discussed in the posts above. As an alternative, you can consider darker colored fine quartz sand, together with some ketapang leaves to lower the pH. Dennerle aquarium gravel is rounded and is safe for bottom dwelling fishes such as corydoras. But I think they are slightly bigger than what the plecos would be comfortable with. Still, I use them in some of my pleco tanks.
Cheers,
I have dwarf cichlids in my tanks! Do you?
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