An awesome plant, that's highly adaptable. I took six rooted and sprouted pods directly from SW to FW with no acclimation and they've thrived. They are an exercise in patience. A pretty slow grower. If you can come up with your own means of suspending the pods so that they are 1/2 submerged, the thick roots will reach for the substrate and establish themselves, making for an interesting self-aquascaping plant. Though I've never tried it myself, they should do just as well in a brackish tank.
I have two in a freshwater 10 gallon. One had its roots previously damaged by a crayfish and many of its leafs fell off, yet a month later it lives of with a few yellow leafs and a half brown one. The other one, which has a very small root system, has kept its dark green leafs. Adding fertilizer helps a lot and misting it often is a must, regardless of water type. I wasn't misting them at the start and both started to wilt but once I began to mist them things turned around.
These have a tenancy to suck up magnesium. Its a good idea to test for Mg with these guys (especially if you are keeping salt water). They are slow growers that enjoy an anoxic substrate. Try and buy seeds that don't have leafs or roots yet. They do not tolerate salinity changes well.