I've dosed my ATO with 2 teaspoons of Kalkwasser per gallon, but my alkalinity still drops over 0.5 dKH per day. I have a 55 gallon mixed reef with 4 SPS, 4 LPS, and a mix of 7 softies and leathers. I've heard of mixing in vinegar to get an extra teaspoon of kalkwasser per gallon, but I'm reluctant to. Is there any danger to doing this? What are the benefits and what are the dangers? Thanks