I read a few other threads but still figured I would post the question. My PH seems to keep dropping to about 7.8-8.0 My tap is about 7.1 I add seachem reef buffer every week and it seems to go back up. But then it drops again. Could it be from my topoff water being so low PH? I add about 3 gallons a week. I didnt think that would effect it so much.