Hello reefers , so I recently noticed my alkalinity dropped a lot. I last tested alkalinity 1 week ago which read 8.4 and as I tested yesterday (I didn’t test Sunday’s how I usually do) I realized my alkalinity dropped. I never miss a water change on my 20 gal nano which startled me. I did add a two head hammer the day before but there’s no way that could’ve changed it. My current alk is at 7.3, maybe it was testing error , not sure. I am using Red Sea test kits for my major trace elements. What do you guys believe could have been at fault ? Should I raise it up ? I only have two hammer corals in my nano