Anubias

Amauriella Rendle Anubias is a genus of aquatic and semi-aquatic flowering plants in the family Araceae, native to tropical central and western Africa.

In contrast to most plants, Anubias generally prefer subdued lighting and can also produce flowers underwater.

Anubias are considered by many aquarists some of the easiest plants to maintain, since their light and nutrient requirements are very low and also because herbivorous fish will not eat it (with a few exceptions).

Rather than planting Anubias directly into the soil, they should be attached to a piece of rock or driftwood, as they are more likely to grow and thrive when the rhizome and roots are left exposed instead of buried.

And while they were once thought to be among the few plants that do not respond to CO2 addition, hobbyists have seen great results and improved growth with CO2 and high light intensity[citation needed].