05-26-2013, 11:49 AM
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On the pH, leave it alone. The platy will be fine.
The info in our profile of the African Dwarf Frog (I asume this is what you have) says pH 6 to 7.5, and while I am not at all knowledgeable on this frog, I can't see a higher pH causing trouble for an air-breathing frog.
Chemicals to adjust pH seldom work, resulting in fluctuating pH which is very stressful on any fish. And as I said, your platy is fine with a basic (above 7) pH.
The GH is more important, but we can assume it is sufficient if the pH is 8, though this doesn't necessarily follow.