How do I decrease my Ph

[Aquattro]

No. If you can't explain why it is so high, the first thing I would check is the test kit/probe. A tank will not get to 8.8 just in it's own. Something significant would contribute to this. Read the article below, it should be a good starting point. And confirm your testing method :shock:

http://www.advancedaquarist.com/issu...e2002/chem.htm