In a closed system such as an aquarium, plants will grow only as well as their limiting factor.
In a closed system such as an aquarium, plants will grow only as well as their limiting factor. Nutrients and light may be abundant, but some will still always have struggling plants. In most cases, it is because a lack of carbon dioxide (CO2) is limiting any further growth. When plants are growing poorly and light and nutrients abound, algae can become an issue. Certainly, a CO2 injection system will resolve this problem, and modern units are now available that are simple to install and regulate.