I need aragonite to raise my kH from what would be around 1-2 without it. But now my pH is in the mid to high 7s. I had one CPO crayfish pass shortly after introducing him to my tank. The other crayfish and countless shrimp that I introduced all lived (two different tanks but same tap water and arragonite-filled stockings). One death is bound to happen at some point, right? Well...my LFS read me the riot act that my pH is way too high and that they wouldn't make good on their 48 hour guarantee. Is my pH really that high? And if so, how do I lower it while still buffering my kH.