Having moss take over and invade your tank is probably the last thing you should be worried about, especially in low tech. It really doesn't grow that fast and you just turn off your filter cut off the growth and suction out or use a tweezer. Compared to other mosses, yes java is a faster grow, but christmas moss is fine... but I don't want a plant that will take off and invade my entire tank.
I've had moss in practically every tank I've setup and it's never been a problem. Now if your talkng about riccia or duckweed that's another story.