I have always been sort of a "small time" hobbiest. I just moved up from a 55 to a 75 and am taking a more serious approach to maintenance and the health of my inhabitants. So, I got all I need to set up an automated 2 part calcium alkalinity supplement system and last night I did some tests to try to figure out where to start and how much I need to adjust my levels before automating. My results were a little puzzling though. I hope someone can help. My calcium level was 415 and my alkalinity was 14.7 I really am not a chemistry guy, but I know that the alk reading is very high. What does this mean? Do I need to do something to try to adjust it or will it come down if I just add some calcium without the alkalinity part of the supplement? Help me out here. I am not sure of all of my other parameters, but I am going to do more testing tonight.