My tank is doing great. I'm over feeding a little and may have a few too many fish/invertebrates (maybe). (I'm reducing my feeding) The result is my phosphates are a little high (.08/.09). So I run GFO which brings my phosphates to .06. But my alkalinity drops to 7.7 from 8.2. I dosed my tank with bulk reef supply soda ash to bring it to 8.1. The problem is my favorite Duncan Coral just disappeared and died. This is my game plan (please help). Reduce feeding a little, do a few extra water changes, forget about the soda ash. if your numbers are a little lower don't worry about it. FYI, I love reefing, but one little mistake can result in a lot of problems. I wish all individuals that don't believe in climate change owned a coral reef tank. The world would be a better place. lol