Okay I will do that thank you, I’m very surprised your mixed reef which includes that many alk/cal vacuum clams only uses .5 dkh lol. What do you dose?If you measure at the same time daily and have not done a WC, then Alk should not be fluctuating, down maybe, up nope.
Either you have testing error flux or your MG is not in the normal range of 1260-1360ppm and ALK and CA are precipitating out of the water.
Im 180g packed mixed reef including 5 clams and I only use .5dkh per 24 hours, so you with softies using .2dkh daily seems weird.
Just check MG and ensure it’s in the range, if so, try another test.