What did the alk test out at? Did it precipitate out the alk while being stored? I have seen mine precipitate while betting stored and heated. I simply just mix it prior to use now.It has been a while, so I figured I would do an short update. Since I started calibrating my refractometer on each water change and also slowing down the frequency of my water changes I have been having mild success- not losing hardly any corals and no fish loss at all. The Copperbanded is doing well and starting to eat from the water column and not just from his homemade feeder. The 2-3 coral frags I have lost has been to fish picking up the frag and dropping them behind my rocks ( I have drilled holes in my rock for frags plugs to fit into - apparently not tight enough though) - nice of them to decide which corals they want in their home - NOT. I have been dozing by using 25Mg of Kalk in my auto top off- to keep my calcium and ALk in good ranges for the past 2 -3 months. Each time I have tested ( 2-3 times per week) its fine ( ALk 8.2-8.6, Ca 420-430). My Corals are growing - not at super fast rate, but growing and looking good with decent color and PE. My PO4 is running .06-.09, and my No3 is between 5 and 10.
Have been reading that some people have had issue with some salt from Fritz - specifically the Alk levels. So today I was ready to do a 20 gallon water change and I tested by tanks Alk= 8.4 DKL, then tested my new water mixed a few days ago and that is heated to 78 degrees F, it was 5.1 DKL. So ya - I understand why people are saying what they are saying. So in my 30 gallon mixing station I added 60 ML of Soda Ash liquid mix to raise the Alk to 8.0 - per the BRS calculator. I will retest that water tomorrow before I do the water change.
I hope everyone is doing well as they come out of the Covid19 pandemic situation.