Hi, I have this plant in my tank aswell, by the looks of it if you've started it a year ago then I think yours is reeeeeeaaally slow growing. Do you dose ferts? Co2? I had mine tied to a small 2inch chunk of lava rock and it grew out into a ball about the size of a tennis ball in 2 months, but I have diy co2 and mild dosing.
You'll have to be careful tho that with my experience, this plant tends to rot and browns when it gets too thick, I suggest taking it out and removing the bottom "brown/soft and mushy" portion to prevent it from spreading to the whole plant.
Good luck, cheers
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