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Actually, I haven't had to cut it. My fish seem to enjoy trimming it for me. I've resorted to using pointless toothpicks to stick my new grass down. Sigh. I'm hoping it'll start rooting soon before they devour the whole thing.
Urgh. Next step is to use little round discs and sew the stuff down. I can't seem to get the fish to stop pulling it up. This is definitely an annoying plant to keep down.