High light, CO2 injected setups with fast-growing or demanding plants require external fertilization due to the rapid uptake of nutrients by the growing plants. We suggest that you start off with the best possible substrate system and only provide external fertilization when necessary. This can be done by observing your plants. If the new growth is pale or stunted, then start adding CHROME along with SHINE. This combination will supply Potassium, Iron, and trace elements that plants need to sustain rapid growth rates. If the stem plants appear to lack the punchy coloration despite intense lighting, add RED to help bring out the colors. Lastly, If you noticed that the older leaves turning abnormally yellow, begin adding GREEN to provide additional macronutrients to your aquarium.