yes it is very common with sword plants. its emerged growth die back. swords grow two different leafs. one for growing out of water and one for in water. they are grown much easier out of water at the farms. when you get them into a tank, they need to change over so the leaves melt away and the submerged form grows in. nothing to worry about and happens to pretty much every sword.
Everytime I buy a broadleaf amazon swordplant, the broadleaves die off and are replaced by newly grown narrow leaves, and then the plant thrives. Anyone have a similar experience or know what causes this?
Glad to hear I am not the only one who has this problem.
Far from it. it happens to almost every sword you will buy fromt he LFS. some plat wholesalers will sell submerged plants but most sell emerged cause they are simply easier to grow. want something fun to do..convert your sword plant over to a house plant. they live just fine out of water.