Ah - off course you're right. Never thought of something like acid water like that. Brandon has to test that before adjusting the ph-calue off course.funny rain water ive tested in some countries is at 800 ppm. acid rain toxic.
use a water filter. hydro logic has good ones and an upgrade filter to remove the chloramines. most think using an ro will do this but it will only remove them partialy.
you havent even said what the ppm of your water is. that ppm is food for them to depending how high it is.