In light of recent events i decided to test the water quality of my 150g.....everything was fine except my ph is around 6.4.......is this a major problem.....i'm not sure why it is......the rest of my tanks are all at 7.2 and my tap water is also 7.2.......i do have a few pieces of bogwood but not enough in my opinion to drop the ph that low......also i'm not running peat in any of my filters......the tank currently houses a few ca/sa cichlids and a few bichirs......all of my water changes come directly from the tap......should i be concerned with this all the fish seem fine and have been happy in their for awhile