Sgc1107
Aquarium Advice Freak
The lower part by the frag plug is a dark color. What is it? How did it happen? And can I save it by cutting bad off and refrag it?
It does appear you have some die off there. How is the flow? What kind of lighting? What are your water parameters? How long have you had it?
You can try fragging it a half inch or so above the dead area. That can sometimes help. Other times it will continue to die off even after fragging.
I would be concerned with your lighting or some other issue if it has been in the tank a year and is only that big. It doesn't seem to be thriving or growing at a rate you would expect for that length of time.