I need some help. ever since I have begun this hobby my PH has always been 7.0 or 7.2. A few days ago after using Prime my PH went to 6.4 or 6.6. I went to Big Al's and the guy told me that Prime makes that happen sometimes and recommeded that I keep using Amquel Plus like I have been. I also told him that I began to use Proper PH 7.0 but it hasn't changed anything. I just did 2 test today, one in the morning and one a few minutes ago and the PH is still 6.4. And yes I have done several water changes. I even check the water before it goes in the tank and it is around 7.4 to 7.6. Any suggestions? Thanks.