Live aquarium plants have a reputation for being complicated. Between specialized lights, fertilizers, substrates, and CO₂ systems, a beginner can easily assume that every planted tank requires a science degree and a cabinet full of equipment. Fortunately, plenty of aquarium plants are much less demanding.

Live aquarium plants need light, nutrients, and carbon dioxide to grow. Most planted tanks already contain some CO₂ from fish respiration, bacteria, and natural gas exchange. The problem is that demanding plants may use that supply faster than the aquarium can replace it. Adding CO₂ can improve plant growth, color, and overall health. It can also make carpeting plants and other demanding species much easier to keep. Still, a CO₂ system is not a magic button. Light, fertilizer