LPS keeps on dying after few months

That alk is way too high for my blood, also doesn't always go well with low nutrients. What is your PO4 level at?
 
What kind of LPS corals are you having problems with? What exactly happens to the corals? How big is your tank? What kind of lighting are you using?

I don't think an alkalinity reading of 10.5 is the culprit here btw. It's something else IMO.
 
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