I have a simple question really. I have 3 cryptocoryne broad leaf plants and the largest has 12-13cm long leaves which are red and have healthy looking 'veins'. However, smaller green leaves form in places and I was wondering whether these leaves are healthy foilage or leaves which are not taking in c02?
I remember reading somewhere that this plant's leaves go red to indicate it's got enough c02, so why are some leaves green?
Here is a pic of the plant:
Mark.
I remember reading somewhere that this plant's leaves go red to indicate it's got enough c02, so why are some leaves green?
Here is a pic of the plant:

Mark.