Hi I am new and am still figuring out how this works. I am having some difficulties with my ph level and am concerned. I own a 29 gal tank and started this hobby in Dec.2007. I cycled my tank with 6 danios(lost one due to an ornament)and the rest are well. In Jan.2008 I purchased 2 peacock gudgeons,and in Feb. a male and 2 female dwarf gouramis. All of my levels were great until recently. My amonia 0, nitrite 0, nitrate 5.0, and ph a steady 6.6. I have never tested for kh or gh and do a 4 gal. water change every other day with a gravel cleaning when I felt it needed it,but only portions at a time. I feed my fish once a day, not too much,but just enough. About a week and a half ago I decided to get my last 2 fish (bolivian rams) which are in quarenteen right now and a piece of bogwood. I let the bogwood soak in hot water for a few hours and then added it to my tank. I did not do alot of research on it,like I did with my fish. In a couple of days I noticed one of my gudgeons was hiding out,which was unusual,and felt something was wrong. So I tested my water perimeters and found that my ph level dropped to 6.2 from 6.6. I freaked. I called my lfs and talked with someone knowledgable about aquaria and found that bogwood lowers the ph. I took the bogwood out and did quite a bit of water changes,and also added 2 tablets of the jungle jim buffer tablets(which I kinda regret doing),but too late. At first the level came up to 6.4,but dropped back down again,so I did some more water changes and the results were the same. I called my lfs and spoke with another person and she said to leave it alone and that I am messing around too much with the tank and that it will adjust back on it's own. I call somewhere else and they say to put crushed coral or shell in it to raise it back up. I don't want to be too hasty and make any fatal mistakes. Please help!