I just did my weekly water testing today and found that over the last month and a bit that my alkalinity is dropping while my PH was staying steady at 8.2. I was under the impression that alkalinity and PH were tied together. Is there anything I should do to raise the alk
? I'm using the red reef test kit and the scale shows me that I'm on the low side 2.0.
The tank has been up and running since October of 2010 with mostly LPS
corals, and 5 fish, CUC, etc. (120g)
Is this normal? Also I found that changing 20gal every two weeks seems to keep everything in check. I test right before and then 24-48 hrs after the pwc
and all remains the same except as stated above for the alk
in the last month & a bit. Thanks...