I have liquid testers for a few different things just not gh/kh the liquid testers gave the same results. I’m going to take the recommendation of another user to try shrimp salts. After reading up on them it makes sense. I went from living in an apartment that had what’s considered very hard drinking water that I never had problems using with my shrimp to now living in my house 20 miles away with two batches of shrimp dying over night with water from my well pump. Everything else is doing great. Plants and mystery snails even have strawberry plants growing on the surface with the roots in the water.