Okay, well I just bought a pH tester at a pet place. It's the liquid tester. I had tested my tap water like two weeks ago with a strip tester that I bought from Lowe's and it was 6.5. I tested it today with the liquid tester and it only goes to 7.6 and that's what it's at. So it's at least 7.6. I don't know which one to believe. I would think the liquid tester would be more accurate, but I don't know. And it says over 7.6 after I add my nutes too, so that makes me wonder. Do you think that it's over 7.6 and that's what's killing my plants?! I couldn't find any pH down today so it'll have to wait until tomorrow. But I'm guessing that's what's wrong here. I don't know.