C. wendtii is a perfect size plant for a 10 gal! A single plant will not get too big. It should spread automatically. Indeed, it looks like yours has already sent out little plantlets around the periphery of the mother plant. You should be able to transplant one of these bigger plantlets to start a new colony elsewhere in the tank.Yes that’s C. Wendti Bronze. It may out grow this little 10 Gallon before it’s over. I haven’t read anything on how to propagate it. How does that work?