so, I'm guessing I shouldn't use ultra hard water with high lights?
How much wattage and what are your GH/KH readings?
I have off the wall GH and KH (can't remember specific levels) but it is definitely up there. I also have 2 wpg, which is about medium lighting. I have never had a problem with my java ferns, in fact, since the switch to higher lighting, they are doing great!