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I'm not saying the rocks are not the cause but in my experience, rock usually raises the pH if it has any effect at all. Have you tested your tap water's rested pH? Is this a new setup?

Either way, I would put a piece of the rock in a small container of water and test it a bit more. I suppose it is possible there is something in the Flourite that could be causing issues...look at all the problems there have been with Eco Complete in recent years. You may want to do the same test with your Flourite as well.

Baking soda is probably the best way to raise your pH, just do it slowly. Raising the pH quickly will probably cause even more issues with your fish.
 

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My tap water is always at 7.0 -7.2 i should retest though maybe something changed i didn't think about that. i have one small rock i left out of the tank so i will test it and some flourite to. This tank has been established for quite a while in fact i layed the flourite over the existing river sand its a 50/50 mix. never had to deal with P.H. drops like this before all kinda new.
My tap water is always between 8.4 and 8.6 but after resting for a few days or aerating overnight, it drops to 7.6 where it remains. If you are on a public water supply, your tap water can easily change depending on the season and where your water supplier gets the water. During different times of the year, water can be from surface water or ground water here, and both have a different GH and KH (and therefore pH).

I wonder if adding the Flourite over the existing sand could have cut off the O2 supply, causing the bacteria to die and lower the pH? I don't know how much of an effect this would have on the pH (if any) but if it was in combination with a change in your water supply, it could be possible...just a thought...
 

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HaHa, I guess this is a perfect example of the KISS (Keep It Simple Stupid) theory :p

It was pretty "gutsy" to admit a mistake like this and may just help one other person with a similar issue so thanks for updating everyone.
 
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