Hey guys I have a 5 month old 22 gal heavily planted tank. I just started using C02 in the past couple of days. I am using the yeast in the bottle method. My pH dropped from over seven down to the low six's. I realize that the hardnes of my water must be low. Do you think I should be concerned with the pH drop? Will the tank balance itself out? The plants look great (noticeable difference in two days) but I am concerned about the fish. Any opinions?