I picked up a cardinal plant about a month ago from a local fish store. In there tank it was purple, red, yellow all different colors. It looked really nice. Well now it's all yellow. It's growing well, new leaves and getting taller and looks healthy but no color anymore. Fish store guy told me Iron i what makes it so colorful. Well I dose .2ppm of CSM+B which is iron and traces on water change day then .1ppm every other day until next water change day (saturday). Should I dose more CSM+B or is the color of the cardinal more about lighting. Or maybe CO2. Neither of which I have a lot of.