Ok, so either I'm doing the test wrong or it took 18 drops with the AP GH Test to change colors. In the tank I have Eco-Complete, Plants, 2 big pieces of Malaysian wood and several stones which were identified as quartzite, and ammonia. Any ideas what went wrong? The last time I did it, it was at 11 degrees. (FYI I had no problems with the KH test and it did just fine at 7 degrees)