I hope this is the correct place to post this question. I am trying to do a 55g tank for angelfish, blue rams, etc. I have very hard water, so I mix 1/3 tap, 1/3 distilled, 1/4 RO drinking bottled water. The gh is 7-8. Kh-6-7. My live ph meter is hard to read, but I thought it was 7.4-7.6. Ammonia, nitrites-0. Nitrates-20 or under. I recently put a purigen in the filter. I started worrying the would get harder because the purigen would absorb the driftwood a tannins. I finally purchased a ph HIGH RANGE liquid test today (it was the only liquid test I was out of). It read 8-8.2. My kh/gh are still 6-8. How is this possible? My tap water is only 7.8! After mixing with RO, I just don't understand how it's higher! My fish seem fine, and in fact I think my rams are mating http://youtu.be/fHQu-2CbSEA . Can someone please hell me understand! The only chemicals ever used in this tank were dr. Tim's one and only, and prime. I understand that if the fish aren't freaking out, I should do nothing. But, I just want to understand.