01-16-2012, 11:14 PM
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1)depending on where you want your pH, yes just add to tap if you want greater than 7.0. R.O will get you a neutral pH
2)if not by r/o water you can do it naturally, which is best. peat, crushed coral, chemical buffers, etc. try not to use chemicals if you can though. what is your goal as far as water parameters. not including the 3 toxins. its a given that you want them low
3)no formula. you are going to have to experiment to get the settings you want. there is no right or wrong. just spec the water to the fish you tend to keep.
4)yes you can add tap directly to tank. if you have a planted tank, you must add nutrients back for R/o water is pretty much stripped of it though.