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OK, I will pick up for KH test kit. In the mean time I did a 20% water change and added about a handful of crushed coral (in a media bag put inside of one of the filters). The pH measured 7.0 right after the water change. Over the last 3 days the pH has been slowly dropping--about 0.2 a day...

Thanks! For reference here is the link: http://www.aquariumadvice.com/forums/f12/ph-below-6-0-due-to-heat-162790.html

I ordered some crushed coral. I was planning on putting it in a media bag and then putting it in my canister filter. How much should I add at a time? And how long should I wait to see what effects it is having before I consider adding more? Thanks.

Thank you for your welcome. So should I try buying a KH test kit as a first measure?

Sorry for the text wall, just want to provide as much information as possible because I can't figure this out: On my liquid API test kit the pH color for 6.0 (or presumably less) is yellow. This is the color I get when testing the water in my aquarium. When I use the 'high pH' test kit I...