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My swords did this as well. It could be your lighting, I don't know. They lived until I decided to pull them up cause I wanted to put something else in it's place. It just might be adjusting. If there is green on the leaves I wouldn't trim those off. If the leaves are totally brown, yeah cut them off. Just so you know, well maintained swords will outgrow that tank. They get HUGE. So you may at some point have to remove them, but for now, no big deal.
Increasing your biodiversity increases your stability.
You know what this tank needs? ........................ Crypts.