As others have said I would give them a little bit of time to see if they bounce back but there are a lot of factors that can make a plant die off, live but merely survive or actually thrive in your tank. When I first started keeping aquarium plants i expected to plant my plants and have them grow looking like the picture perfect aquariums I saw in magazines. I planted my first few plants and within a few weeks I had what looked like a failed science project in my living room. I then spent a lot of time and money trying to get everything growing and looking just right but got tired of all the trial and error finding out what I could actually get to thrive in my tank. I finally decided to just go with the 3 plants that thrived and then planted a lot of each and just went with an over grown jungle look. In soft water I had Amazon swords, Rotala Indica and Cryptocoryne Wendtii grow like crazy. In my new house we have very hard water and I'm now growing Italian Val and Anacharis with great success along with the Cryptocorne. The Crypts took a couple of months to get going after the move but the Amazon sword and Rotala died off and never came back. I would suggest instead of trying to create the type of water your plants will thrive in, test your water and then find plants that should thrive in those conditions.