* * guess mode * *
I'd say your Xenia is still acclimating. I'd bet that the tank it came from had lower ALK
levels. A PH of 8.0 will often cause them discomfort from my experience. I *think* you are getting PH fluctuations from the ALK
being so high (ironically). When Carbonate levels reach a critical point it will precipitate by condensing onto a Ca
molecule. This will lower the PH to a certain point and then the precipitation event stops.
* * out of guess mode * *
I suggest you first verify your ALK
with a different test kit (or the LFS
, etc.). If the same reading is obtained (probable) I would stop all ALK
additives including the Kalk
. Temporarily switch to Calcium chloride to maintain the Ca
where you want it. Once the ALK
has dropped to a more reasonable level (3.5 - 4.0 MEq/L), return to Kalk
for your topoff.