I do not suggest floating swords. If they have even 3 or so small roots plant the roots and be sure not to bury the crown of the plants and then put a root tab close to it. A also don't like floating val's. It is very common when planting vals for them to slightly melt and take quite some time before they start growing well. They just need time, usually many weeks, for them to really acclimate, settle in, and finally begin to take off. If they melt do not remove the roots, just let the leaves melt off. Sometimes new growth will begin, same as with crypts. You also don't need to use pots. Just plant in your substrate. Once val's take off they send out runners with new plants on them which doesn't work well in pots.