Is the green on the end of this stump new plant growth or fungus that I should cut off? I read a little on lucky bamboo and they seem hearty other than being chloride sensitive and being susceptible to fungus.

I’m very much a novice, so please excuse me if this is a simple question. I inherited a lucky bamboo plant and have trimmed it and began forming it with guide wire. I also clipped the clearly yellow/brown ends.