Mine have done fine in water with a pH of 8. Maybe grow slower, but they aren't terribly fast to begin with, being ferns. They also seem to be quite unconcerned with lighting (as long as it's not super low). I really like them, they are full and good for mid-ground. And they just do their own thing, which is always a plus.
These are related to java fern in some way (so I heard somewhere, don't ask me where), and propagate as such.