1. what would equate to a very diluted 7.6 color? is that considered 7.6?

I would try re-doing the test. Make sure there are no bubbles in the drops
when add them to your water sample. Also, make sure your test tube is clean,
and don't cover the end of the tube with your finger. Use the cap.

2. can a pH drift from 7.0 to 7.6 in two days when you dont' do anything?

Yes. It may mean the plants are stripping all the Co2 out of the water. How
much light do you have over this tank?

As for the GH...it could be a fluke in the water supply, or it could be
something dissolving in your tank. Gravel, rocks, shells, etc.

If you're using Onyx sand or gravel for a substrate, it will definitely raise
your GH.



Leigh

http://www.fortunecity.com/lavender/halloween/881/