Green spaghetti leathers

[Phormium]

I have 3 of these in my tank, only one is in the picture (they weren’t all expanded at the time I took the photo). When fully expanded they are about a foot tall. They are all mounted onto one rock at sand level, but 2 have attached partway up on my rockwork. They are just getting too big (annoying to the montis below) and I’d like to get rid of at least 2 (depending on how easy to remove). Not interested in fragging them and they can’t be relocated to another spot in the tank. I expect to be able to cleanly cut them away with single razor blade.
I just want them gone, so open to any and all offers. Not sure what they are worth?