It seems to color red due to high amounts of light and cold water; at least that is what i've seen on Facebook.
If it's just the red carpet you're after..........you can go for the algae "Caloglossa beckarii" (may be wrong spelling, but close)If these are fake then damn as I was liking the look of it hahaha , a red carpet plant .... They should cross breed some species and get it done
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Very true......and tends to go more brown, than red , actually^^ this looks too much like a moss then of a leafed plant
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Mine are way darker than this, actualy. more purple-redBut still nice
Simon's Aquascape Blog