I assume you are keeping red stem plants like rotala macrandra or alternanthera.
Such plants are usually farmed emmersed under sun intense lighting, under such optimum condition they turn red and proliferate well.
In a planted aquarium where the condition suddenly change, the plants will start to adapt, new leaves turns out softer (submersed form), roots sometimes grow from the stems. When the intensity of light and nutrition is not up to the condition required, plants will also adapt to survive by creating more of the green chlorophyll which is more efficient at utilizing the intensity and quality of the existing light instead of retaining the light-demanding red chlorophyll (which makes the plant appears red).
If you happen to receive the plant in submersed form, it is likely that the plant has been cultivated under water in optimum condition (light, nutrition, water chemistry, etc).
Some aquarists find that by meeting the lighting intensity demand and trying to reach certain chemical parameters may help red plants retains its colours.
Having red plants in a setup does not depend solely to nutrition (fertilizer), though it cannot be denied nutrition factor is an important precursor.









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