No its not and the number was stable for a long time. I had the calcium reactor set so it only turned on when ph in the reactor had gotten to be 8.3. A couple people pointed out this was wrong so I read the directions again and realized I had to set the c02 to come on at 6.8 creating a drip with more calcium dripping back in. I am going to shut the reactor off as i believe you are correct that my lps and sps load isnt enough to require the reactor and is now causing the alk to creep up.