Moved an Acan to a shadier spot, hopefully it will take to this spot since it hasn't taken to any of the previous. Also put my newest zoa frags in their homes and moved my sps frags up a couple inches in my tank. Received my Hanna Alk checker today and tried it out. It looks to be pretty close to what my salifert is giving me. I am sure it will take a few testings to get used to and start getting consistent readings. They were close enough that I am betting the actual level is somewhere between the 2 in the +/- range of each.