I know that there have been a couple of posts lately on one or two of the boards - probably reef central and ??? about how if you live in a new home that has good window and door seals the CO2 in the house does rise causing the PH to be a challenge to keep up. Some people have run their air line from their protien skimmers and other equipment outside to try and draw outside air in to help with the low PH. Don't know if having the planted tank in the same room would cause enough C02 to build up and effect your PH but it is probably something to watch if you don't have windows open etc.
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