I attached a photo of my java fern which has grown out of control. I am wondering if the whole plant will die if I were to cut the rhizome and re-plant it elsewhere in the tank. While it's growing really well it's just become to large and needs to be moved.
What's the story do you think the whole plant dies if I cut it?
No it should be fine. Java fern is a funny plant. I had one in my 75 and eventually got to the size of a basketball so I then put in my 125 and over the next 3 years shrunk down to like 4 leaves and then put it back to my 75 and now it's exploding again.