This is the first time this has ever happened since I have had my tank, but for the past three weeks my pH has dropped and I have no clue what is causing it to do so. I have been using balance by seachem to raise the pH back up but went today to get my water tested and it dropped .2 since last week. Anyone know what could be causing this drop? My tank is a coral only system and my params are 0 across the board.