It looks like normal acclimation melting. Some plants shed their leaves and grow new ones when they need to acclimate to new water parameters. How long have these been in the tank? Can you tell me more about the set up in question? How many hours of lighting, how is the flow in the tank, do you inject co2?
Do you have water test parameters? It would be easier to figure out what is wrong by running down the list of conditions.