one thing to note, if you use RO water and nothing else like was mentioned it is unstable.. PH will be all over as there is nothing to buffer it alk will be nuts... not recommended in any book. what is recommended is that if you use RO, then you must use a re-mineralizer or something like that.. ie black water extract, discus buffer ect.. this will re buffer the water to proper levels as you won't have anything left in the water to buffer it.
Steve
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