Ludwigia sp. 'Red' on the left, Ludwigia 'Rubin' on the right. The Red took about 2 weeks to turn that color while the Rubin has only been in the tank for 2 weeks and only has orange under the leaves. It's still growing though, about an inch every few days. The tank has DIY CO2 and daily Metricide-14 dosing, EI dosing, and MGOCPM capped with Seachem Black Sand. The light is a 27 watt daylight desk lamp positioned 3 inches above the water timed for 6 hours with a 4 hour blackout then back on for another 5.