You should wait and see but if the problem still exists then there may not be enough iron in the water. Swords need it. Also little is known about this but Amazon Swords compete with each other like some fish. The release a hormone that will stop other swords from eaching their full potential. If you have many, they will all stay the same size. If one gets larger than the others, they will stop others from growing large.
thePlantMan cometh.................