Though I haven't seen any confirmed water stats from their area of origin, I have found them hardy at both soft acidic and hard alkaline water conditions. I have seen many reports of Anacharis making up the bulk of the plant matter in their origional habitat

There are wide temerature fluctuations in their natural habitat, so they are flexible here. Anacharis however prefurs cooler water, say arround 24 centigrade.
HTH
Rabbut
EDIT to add; Java moss, and other types of moss, make ideal spawning areas for these fish. They are relitively easy to breed, and rarely eat their own fry.