So I recently got a pH controller and I would notice that the pH would drop down to around 8 or even 7.9 at times at night, and it was only getting up to 8.2 during the day. My corals were doing fine and so were the fish, but I was trying to get it up to around 8.3. So I figured that I would increase my kalkwasser dosage. (I was using around 1 teaspoon/gal.) I increased to two teaspoons yesterday when I refilled the reservoir and it seemed like all was going well. I walk over to the tank today and notice that everyone is acting strange. The freaking wanter was at 8.98. I did around a 30% water change and removed all the water from the reservoir. Its down to about 8.7 now and I'll do another change later if it doesn't keep dropping. A lesson learned on a little too much tinkering on my part today, and probably too much of an increase at that.